Papers are solicited on, but not limited to the following topics. ;
In progress – view active session
Conference 11898

Holography, Diffractive Optics, and Applications XI

In person: 10 - 12 October 2021
On demand now
View Session ∨
  • Opening Ceremony and Plenary Session I
  • 1: Diffractive Optics
  • Plenary Session II
  • 2: Novel Holography
  • 3: 3D Holographic Reconstruction
  • 4: Scanning Holography
  • 5: Near-Eye Displays
  • Poster Session
  • 6: Holographic Microscopy
  • 7: Deep-Learning for Computational Imaging
  • 8: Novel Techniques
  • 9: Grating Fabrication
  • 10: Optical Computing
  • 11: Holographic Applications
Opening Ceremony and Plenary Session I
In person / Livestream: 10 October 2021 • 09:00 - 12:00 China Standard Time
9:00: Opening Ceremony
9:20: Awards and Recognition

11900-501
Author(s): Rebecca R. Richards-Kortum, Director, Rice 360 Institute for Global Health Technologies (United States), Rice Univ. (United States)
In person / Livestream: 10 October 2021 • 09:30 - 10:10 China Standard Time
Show Abstract + Hide Abstract
This talk will examine the challenges of designing and translating new low-cost optical technologies to improve global health equity, drawing from examples to improve newborn survival in African hospitals, to improve early detection of cervical cancer for women in Texas and Latin America, and to improve point-of-care diagnosis of COVID-19. The talk will summarize lessons learned to increase the diversity of innovation teams, and to increase the impact and sustainability of the resulting innovations.
Tea/Coffee Break 10:10 - 10:40
11890-502
Author(s): Wentao Wang, State Key Lab. of High Field Laser Physics (China), CAS Ctr. for Excellence in Ultra-intense Laser Science (China), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 10:40 - 11:20 China Standard Time
Show Abstract + Hide Abstract
X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region and have become indispensable tools for applications in structural biology and chemistry, among other disciplines. Several X-ray free-electron laser facilities are in operation; however, their requirement for large, high-cost, state-of-the-art radio-frequency accelerators has led to great interest in the development of compact and economical accelerators. Laser-wakefield accelerators can sustain accelerating gradients more than three orders of magnitude higher than those of radio-frequency accelerators, and are regarded as an attractive option for driving compact X-ray free-electron lasers. However, the realization of such devices remains a challenge owing to the relatively poor quality of electron beams that are based on a laser-wakefield accelerator. After ten years of efforts, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime by using electron beams based on a laser-wakefield accelerator.
11893-503
Author(s): Rui Zhu, Peking Univ. (China)
In person: 10 October 2021 • 11:20 - 12:00 China Standard Time
Show Abstract + Hide Abstract
Perovskite solar cells have attracted tremendous attention in recent years due to the high device performance and the superior optoelectronic properties of perovskite materials. In this talk, I will give an introduction about the advances of perovskite solar cells. Then, I will present our efforts on improving the device performance and understanding the device physics of perovskite solar cells. In addition, I will also discuss the advantages of perovskite solar cells for space aircraft application. We have some preliminary efforts of sending the perovskite solar cells into near space. I will share our view about the exciting possibilities for perovskite solar cell technology.
Break
Lunch Break 12:00 - 13:30
Session 1: Diffractive Optics
In person: 10 October 2021 • 13:30 - 15:10 China Standard Time
Session Chair: Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
11898-1
Author(s): Qiwen Zhan, Univ. of Shanghai for Science and Technology (China)
In person: 10 October 2021 • 13:30 - 14:00 China Standard Time
Show Abstract + Hide Abstract
Pulse shaping has become a powerful tool in generating complicated ultrafast optical waveforms to meet specific application needs. Traditionally pulse shaping focuses on the temporal waveform synthesis. In this talk, I will present a recently developed technique that allows us to direct imprint modulation to the spatiotemporal domain. The concept is experimentally verified through the generation of spatiotemporal optical vortex (STOV) and STOV lattice. The power of the method is further demonstrated by the generation of other exotic spatiotemporally sculptured light fields. Such a direct mapping technique opens tremendous potential opportunities for sculpturing complex spatiotemporal waveform and enables the development of optical systems with novel functionalities.
11898-2
Author(s): Zeqing Yu, Chang Wang, Lingmei Chen, Qin Xie, Xinyu Liu, Fei Wu, Zhenrong Zheng, Zhejiang Univ. (China)
On demand | Presented Live 10 October 2021
Show Abstract + Hide Abstract
The widespread use of holographic VR/AR devices are limited by bulky refractive and diffractive optics. To address these problems, a NED system combining the 3D CGH based on Fraunhofer diffraction and a metalens with 5 mm diameter as an eyepiece is proposed in this paper. Because of the capability of wavefront shaping in a subwavelength scale, the metalens eyepiece surly facilitates lightening the CGH-NED systems. Experiments are carried out for this design, where Fraunhofer diffraction with digital lens phases of different focal lengths are applied, and the metalens transforms the holographic reconstructed 3D image into virtual image to realize NED. The metalens eyepiece composed of silicon nitride anisotropic nanofins is fabricated with the diffraction efficiency and field of view for 532 nm incidence of 15.7% and 31°, respectively. Our work combining of CGH and metalens may provide a promising solution in future for computer-generated holographic 3D portable display.
11898-3
Author(s): Mingfeng Xu, Institute of Optics and Electronics (China)
In person: 10 October 2021 • 14:20 - 14:50 China Standard Time
11898-4
Author(s): Dandan Wen, Northwestern Polytechnical Univ. (China); Jasper J. Cadusch, Jiajun Meng, Kenneth B. Crozier, The Univ. of Melbourne (Australia)
In person: 10 October 2021 • 14:50 - 15:10 China Standard Time
11898-6
Author(s): Jae-Hyeung Park, Dae-Youl Park, Inha Univ. (Korea, Republic of)
On demand
Show Abstract + Hide Abstract
We present two applications of the hologram signal processing based on the mutual conversion between the hologram and light field. Both hologram and light field represent the light from three-dimensional objects but with different characteristics. This feature can be utilized to update the hologram for desired purpose without prior knowledge on the three-dimensional objects in the hologram. In this talk, we show how this mutual conversion can be used to update existing holograms to new ones for their speckle-free optical reconstructions. We also discuss hologram update which scales three-dimensional objects in the hologram with constant transverse and axial magnifications.
11898-5
Author(s): Qi Zhao, Chi Man Woo, Huanhao Li, Tianting Zhong, Zhipeng Yu, Puxiang Lai, The Hong Kong Polytechnic Univ. (Hong Kong, China)
On demand
Show Abstract + Hide Abstract
In this work, we proposed a parameter-free algorithm (PFA) for iterative wavefront shaping, in which the time-consuming parameter tuning process is not required. The simulation and experiment results show that PFA can achieve better performance than GA and BA, without a parameter tuning process. Furthermore, since the mutation rate in PFA is inherited from the dynamic mutation algorithm, which has demonstrated high adaptability against perturbations, the robustness of PFA is satisfactory. In the future, a field-programmable gate array (FPGA) based system can be implemented to accelerate iterative wavefront shaping and achieve real-time optical focusing in dynamic scattering media, such as biological tissue.
Break
Tea/Coffee Break 15:10 - 15:30
Plenary Session II
In person / Livestream: 10 October 2021 • 15:30 - 16:20 China Standard Time
15:30: Welcome and Introduction

Q&A period will follow after the talk
11905-504
Author(s): Peter L. Knight, Blackett Lab., Imperial College London (United Kingdom), UK National Quantum Technology Strategic Advisory Board for UKRI (United Kingdom)
In person / Livestream: 10 October 2021 • 15:35 - 16:05 China Standard Time
Show Abstract + Hide Abstract
The UK through a mix of government and industry funding has committed more than £1Bn over 10 years to a coordinated programme in quantum technology. Seven years into this programme I will describe here how we got there, and our goals for the future. The UK National Quantum Technology Programme has induced a step change in the UK’s capabilities for pushing forward a new sector in future information technologies. I describe how the programme arose and the activities it supported and influenced to deliver these new capabilities, building on a first phase almost £480M investment across several UK government agencies. The UK programme is now in its second phase, with a further substantial investment by UK government and global industries in the UK making a total of over £1Bn. I will describe our plans for ensuring the advanced quantum science and demonstrator platforms in imaging, sensing, communications and computing developed over the past seven years will drive the formation of the QT sector and embed quantum tech in a broad range of industries. References 1. “Blackett Review: The Quantum Age: technological opportunities.” Government Office for Science, Available: https://www.gov.uk/government/publications/quantum-technologies-blackett-review; https://uknqt.ukri.org/files/strategicintent2020/; Peter Knight and Ian Walmsley 2019 Quantum Sci. Technol. 4 040502
Break
Tea/Coffee Break 16:20 - 16:30
Session 2: Novel Holography
In person: 10 October 2021 • 16:30 - 18:00 China Standard Time
Session Chair: Qiwen Zhan, Univ. of Shanghai for Science and Technology (China)
11898-7
Author(s): Mingguang Shan, Zhi Zhong, Lei Liu, Harbin Engineering Univ. (China)
In person: 10 October 2021 • 16:30 - 17:00 China Standard Time
Show Abstract + Hide Abstract
Owning to the advantages of wide-field, highly precise and quantitative phase measurements for microstructural and biological objects, digital holography (DH) becomes a well-known optical measurement technique. To solve the problems of short ambiguous range limited by single wavelength and incapability for phase objects with sharp edges, dual-wavelength DH (DWDH) is proposed and attracts much attention from the research community in recent years. Firstly, a single-shot common-path off-axis DWDH aided by spectrum-divided multiplexing is presented for real-time acquisition. Then, two fast phase retrieval algorithms by division-multiplexing and square-filtering are then employed for real-time phase retrieval. Finally, in contrast to the state-of-the-art DWDH unwrapping algorithms, a direct linear programming algorithm is done to achieve better reconstruction quality with concise process. In our opinion, these methods would be practical for real applications.
11898-8
Author(s): Zhuoshi Li, Chao Zuo, Qian Chen, Nanjing Univ. of Science and Technology (China)
In person: 10 October 2021 • 17:00 - 17:20 China Standard Time
11898-9
Author(s): Qin Zhang, Mengjing Jian, Chao Liu, Yuhong Wan, Beijing Univ. of Technology (China)
On demand | Presented Live 10 October 2021
Show Abstract + Hide Abstract
Fresnel incoherent correlation holography as a self-interference holographic technique is employed as three dimensional (3D) localization method of fluorescent microspheres, thus to obtain 3D microscopic imaging. In order to promote the localization accuracy and the reconstructed image quality, autofocus algorithm is introduced to help finding accurate reconstruction distance in the Fresnel Incoherent Correlation Holographic (FINCH) localization microscopic imaging. The performances of autofocus algorithm under different evaluation parameters of reconstruction images are investigated, and the suitable autofocus algorithm are used during hologram reconstruction. The localization algorithm is utilized based on the reconstructed image. The localization accuracy and imaging quality are compared with and without employing the autofocus algorithm. The enhanced localization accuracy is realized in the actual FINCH localization microscopic imaging system.
11898-78
Author(s): Jila Rafighdoost, Xing Li, Yuan Zhou, Meiling Zhou, Manman Li, Shaohui Yan, Baoli Yao, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 17:40 - 18:00 China Standard Time
11898-11
Author(s): Tatsuki Tahara, National Institute of Information and Communications Technology (Japan); Yuichi Kozawa, Tohoku Univ. (Japan); Takako Koujin, Atsushi Matsuda, Ryutaro Oi, National Institute of Information and Communications Technology (Japan)
On demand
Show Abstract + Hide Abstract
We present incoherent digital holographic microscopy systems for high-speed three-dimensional (3D) motion-picture sensing. Adopting single-shot phase-shifting interferometry to incoherent digital holography, high-speed motion-picture recording of spatially incoherent digital holograms can be enabled. Single-path self-interference incoherent digital holography systems are designed and constructed utilizing the polarization of light waves and birefringent optical elements. We describe the systems constructed until now and show experimental results including three-dimensional motion-picture recording of incoherent digital holograms for fluorescent nanoparticles in a flow, at the frame rate of more than 100 fps and with 1024 x 1024 pixels and the field of view of 148 um x 148 um. Furthermore, we have succeeded in extending the applicability of incoherent digital holography to 3D sensing of objects with compact optical systems.
11898-12
Author(s): Yusuke Ogura, Osaka Univ. (Japan)
On demand
Show Abstract + Hide Abstract
Diffraction limit is a limiting factor not only in imaging but also in generating an optical field or illumination. We focus on subdiffraction limit illumination created using a computer generated hologram and its applications. Structured illumination which consists of an array of subdiffraction limit spots or light sheets can be obtained by controlling the phase distribution in the optical field. Performance and properties of subdiffraction limit illumination are discussed. The method has a wide range of applications, and resolution improvement of laser scanning microscopy is presented as an example.
Session 3: 3D Holographic Reconstruction
In person: 11 October 2021 • 08:50 - 09:30 China Standard Time
Session Chair: Yaping Zhang, Kunming Univ. of Science and Technology (China)
11898-13
Author(s): Feiya Ma, Fang Wang, Rui Yang, Jian Liang, Liyong Ren, Shaanxi Normal Univ. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
It is well known that the three-dimensional (3D) imaging has inherent advantages than the two-dimensional (2D) imaging. However, the existing 3D imaging methods are limited by expensive instruments or complex systems. And previous researches have shown that, owing to the fact that there exists a functional but determined relationship between the polarization information of light reflected from a target and the surface normal of it, the shape information of a 3D target can also be obtained by measuring and analyzing the polarization properties of the reflected lights. Indeed, the 3D reconstruction imaging method based on the light polarization has shown great potential in future 3D imaging applications due to its advantages of high reconstruction accuracy and simple detection equipment involved. Note that, in the process of reconstructing the 3D shape of an object based on the light polarization information, there always exists an inherent ambiguity problem, i.e., the ambiguity of the azimuth angle. To solve this problem, we propose a new method to determine each zenith angle by sorting them corresponding to all pixels in the same row of the image.
11898-14
Author(s): Mengjing Jian, Chao Liu, Qin Zhang, Yuhong Wan, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
We proposed here a new method of encoding and extracting the 3D position of fluorescent micro particles. Cross-correlation matching method is employed to localize the axial position of fluorescent microsphere. And the localization accuracy of the proposal is compared with that of the traditional diffraction reconstruction algorithm. The effectiveness of the method is verified by both simulations and experiments, and the localization accuracy of the method are evaluated quantitatively. This method overcomes the limitation of the imaging depth in the traditional single molecule localization, reduces the influence of optical aberration on the localization accuracy, and it possess the potential of achieving the isotropic super resolution localization of the sample.
11898-16
Author(s): Honghao Zhang, Satoshi Hasegawa, Utsunomiya Univ. Ctr. for Optical Research & Education (Japan); Haruyoshi Toyoda, Hamamatsu Photonics K.K. (Japan); Yoshio Hayasaki, Utsunomiya Univ. Ctr. for Optical Research & Education (Japan)
On demand
Show Abstract + Hide Abstract
A method that realizes the three-dimensional holographic laser reconstruction and processing by using an optimized computer-generated hologram (CGH) was demonstrated. A pre-designed CGH that contains three-dimensional (3D) information displayed on a liquid-crystal-on-silicon spatial light modulator (LCOS-SLM) can obtain the desired 3D diffraction pattern in the optical system, called 3D holographic laser reconstruction, and when it is reduced by an objective lens and incident on a sample, it can realize the 3D holographic laser processing. Using an optimization method, called in-system optimization, to compensate for the imperfections that exist in the actual laser system, and obtain the high-quality CGH. Consequently, a high uniformity 3D holographic laser reconstruction was achieved, and the consistent scale of the corresponding processing holes proved the feasibility and significance of the CGH optimization.
11898-15
Author(s): Yunping Zhang, Edmund Y. Lam, The Univ. of Hong Kong (Hong Kong, China)
On demand
Show Abstract + Hide Abstract
3D micro-particle field reconstruction with high accuracy and low latency is an ambitious and important task within various applications. In this study, a deep learning based one-stage detector is developed for 3D particles distribution recovery from a digital hologram. This model facilitates the analysis of the dynamic displacements and motions for microparticles or cells and could be further extended to various types of computational imaging problems sharing similar traits.
Session 4: Scanning Holography
In person: 11 October 2021 • 09:30 - 10:30 China Standard Time
Session Chair: Xiaodi Tan, Fujian Normal Univ. (China)
11898-17
Author(s): Yaping Zhang, Yongwei Yao, Bin Wang, Houxin Fan, Kunming Univ. of Science and Technology (China); Ting-Chung Poon, Virginia Polytechnic Institute and State Univ. (United States)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Edge extraction is an important pre-processing operation in image processing and pattern recognition in machine vision. For example, coherent optical image processing for edge detection can be performed in a standard 4-f system with proper pupil designs. The possibility of pre-processing using digital holography for 3D image edge extraction is intriguing. In this talk, we will review some of the edge detection techniques used in single-pixel digital holography called optical scanning holography (OSH). OSH is a two-pupil system and different edge detection schemes through the different combinations of pupils are discussed.
11898-18
Author(s): Juan Liu, Xueliang Shi, Zhiqi Zhang, Zijie Zhao, Shijie Zhang, Beijing Institute of Technology (China)
In person: 11 October 2021 • 10:00 - 10:30 China Standard Time
Show Abstract + Hide Abstract
The Maxwellian display alleviates the vergence-accommodation conflict (VAC) in near-eye displays (NEDs), but limits the eyebox. We propose a novel method to extend the eyebox and eliminate the multiple or blank image problems based on a multiplexed holographic optical element (HOE) and two polarization gratings (PGs). Four viewpoints are generated and simultaneously activated in the horizontal direction to achieve an enlarged eyebox. By mechanically moving a PG, the spacing between viewpoints can be changed, thereby ensuring that there is only one viewpoint in the eye pupil. Compared with other techniques to extend the eyebox of Maxwellian displays, the proposed method shows obvious advantages in a large eyebox, adaptability to the pupil size, and blur-free imaging within a large depth range.
Break
Tea/Coffee Break 10:30 - 11:00
Session 5: Near-Eye Displays
In person: 11 October 2021 • 11:00 - 11:50 China Standard Time
Session Chair: Juan Liu, Beijing Institute of Technology (China)
11898-20
Author(s): Hongfeng Ma, Qiang Song, Shenzhen Lochn Optics Technology Co., Ltd. (China); Xiaoming Guo, Lochn Optics (China); Hao Huang, Xin Yang, Fang Li, Guobin Ma, Shenzhen Lochn Optics Technology Co. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Automatic optimization of diffractive structures is of great interest and has potential applications in see-through near-eye displays. Here, we propose an approach of on-demand design of diffractive elements using the physics-driven topological optimization. The topology is iteratively optimized according to the added constrains in dispersion and angle uniformity. The proposed model provides an effective way for the design of complex electromagnetic components that are essentially irregular and out of the box of human’s designing.
11898-21
Author(s): Yu Mei, Shanghai Univ. (China), Science and Technology on Electro-optic Control Lab. (China); Fei Peng, Luoyang Institute of Electro-Optical Equipment, AVIC (China), Science and Technology on Electro-optic Control Lab. (China); Xinxing Xia, Shanghai Univ. (China), Science and Technology on Electro-optic Control Lab. (China); Yingjie Yu, Banghua Yang, Shanghai Univ. (China); Mingwu Kang, Luoyang Institute of Electro-Optical Equipment, AVIC (China), Science and Technology on Electro-optic Control Lab. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
At present most of the holographic waveguide near-eye displays are based on the flat waveguide, which is always required to add curved goggles for head mounted displays (HMDs). This paper proposes a near-eye display based on curved holographic waveguide, which integrates both the flat waveguide and the curved goggles. This design includes cylindrical holographic waveguide and corresponding micro projection module. We designed special holographic optical elements for cylindrical waveguide and corresponding micro projection module to achieve large exit pupil and field of view. This work can provide a new approach for portable near eye display applied in the helmet or some other related applications.
Break
Lunch Break 11:50 - 13:30
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
11898-26
Author(s): Zhengyuan Tang, Kevin O'Dwyer, National Univ. of Ireland, Maynooth (Ireland); Marion Butler, Adam Dignam, National Univ. of Ireland (Ireland); Bryan Hennelly, National Univ. of Ireland, Maynooth (Ireland)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Digital Holography microscopy is a widely applied technique in biological imaging for retrieving quantitative phase information relating to three-dimensional morphology and has received considerable interest in the investigation of real-time cellular dynamics. Here we report on a recently proposed portable module utilizing an off-axis architecture and an inexpensive laser diode source. The portability of the system enables it to be added to easily to the output port of an existing life-science microscope. An important feature of the module is that it is based on the common-path principle, whereby the reference wavefield is generated from the image wavefield exiting the microscope. This facilitates the source laser to be completely decoupled from the module. Furthermore, the system is highly stable with respect to environmental vibrations and is automatically calibrated regardless of sample thickness.
11898-53
Author(s): Qimeng Wang, Tsinghua Univ. (China); Yuxuan Zhao, Greatar Tech (China); Lijiang Zeng, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
A hybrid optimization model of physical optics and geometric optics is established for optimizing the imaging brightness uniformity by changing the profile depth distribution of the EPE. A specially modified reactive ion-beam etching system capable of modulating the etching depth distribution in two orthogonal dimensions is used to fabricate crossed-grating-based EPEs with variable profile depth. Two EPEs with uniform profile depth and optimized variable profile depth are fabricated and measured. The results show that compared with using the EPE with uniform profile depth, using the EPE with optimized variable profile depth, the imaging brightness uniformity can be improved by 70%.
11898-54
Author(s): Yiwei Liu, Yibo Wang, Qiuya Sun, Hao Chen, Hongpeng Qin, Zhuqing Jiang, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
We present a spectrum filtering approach for reconstruction of off-axis digital holograms. The high frequency aliasing terms in Fourier spectrum domain of hologram are generated by non-fitting interpolation. After interpolation processing, the zero-order terms in the aliasing spectrum region are obviously suppressed. Accordingly, for the spectrum filtering of high-frequency signal terms, the available range of frequency band will increase significantly, which can result in the improvement of resolution of the reconstructed images.We perform the reconstruction imaging with a conventional method and the presented method from the same hologram in simulation. The imaging results show that such interpolation method can obviously improve the resolution of the reconstructed amplitude and phase images.
11898-55
Author(s): Jie Qi, Chenguang Xin, North Univ. of China (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Benefitting from properties including high sensitivity, high resolution, immunity to electromagnetic interference and remote sensing ability, optical-grating-based displacement measuring technologies have been widely used in many fields such as semiconductor manufacturing, precision machining, microscopic techniques and photolithography recently. In this work, high-resolution displacement measuring is demonstrated with an ultracompact structure consist of only a few optical components by using self-interference effect of a single nanograting. The resolution is demonstrated to be as low as 0.1-nm level. This method shows great potential in developing miniaturized high-resolution displacement devices and systems, which are highly demanded for future integrated high-precision machinery manufacturing systems.
11898-56
Author(s): Qiuya Sun, Beijing Univ.of Technology (China); Yiwei Liu, Hao Chen, Yibo Wang, Zhuqing Jiang, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
In this paper, automatic filtering for amplitude and phase reconstruction in off-axis digital holography is developed. A user-friendly interface for automatic filtering is given via program design with MATLAB. This automatic filtering program has high robustness, which can achieve reconstruction imaging for off-axis holograms correctly and effectively in the case of different off-axis angles or different image sizes. For the user interface, upon inputting an off-axis digital hologram and confirming the operation, the reconstructed amplitude and phase images can be quickly output. This user interface has the advantages of simple operation, adjustable parameters and clear feedback. The results show that the quality of reconstructed images by using the presented automatic filtering is not inferior to that by conventional manual filtering.
11898-57
Author(s): Hao Chen, Yiwei Liu, Qiuya Sun, Zhuqing Jiang, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
In this paper, we present a method to eliminate the zero-order term in Fourier spectrum of off-axis digital holograms based on the linear change of the hologram. In a typical digital holographic setup, the three off-axis holograms are recorded by the object waves and the reference waves with the different intensity ratios. The three holograms were Fourier transformed, and then the spectra were linearly fitted to obtain two fitting coefficients. Then, the second and third holograms are multiplied by the corresponding coefficients, and the first hologram is subtracted from the hologram that is multiplied by the coefficient to obtain the hologram with the zero-order term eliminated.
11898-58
Author(s): Xin Fan, Shanghai Institute of Optics and Fine Mechanics (China); Zhengyuan Tang, National Univ. of Ireland, Maynooth (Ireland); John Healy, Univ. College Dublin (Ireland); Bryan Hennelly, National Univ. of Ireland, Maynooth (Ireland)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Show Abstract + Hide Abstract
Digital holographic microscopy provides the quantitative phase image of a sample and has been shown to be a useful tool for the analysis of cellular dynamics. Like traditional microscopes, the digital holographic microscope is limited to a finite set of magnifications determined by the microscope objectives that are available in the nose-piece of the microscope. In this paper, we provide a theoretical investigation on the basis of wave-optics, on the effect of divergent spherical illumination in off-axis digital holographic microscopy. It is shown that this may facilitate a continuously variable magnification and field of view by simply moving the sample the set-up along the optical axis in the area above the microscope objective. We propose a practical implementation of the method using infinity microscope objectives. A theoretical comparison of this approach with the original Gabor microscope is also discussed in detail.
11898-59
Author(s): Li Fan, Biaohan Liu, Xilin Long, Zhejiang Univ. (China); Chong Li, Xiaowen Dong, Huawei Techonologies Co.,Ltd (China); Jialin Cheng, Jianjun He, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
In this paper, we propose a method to realize complex amplitude modulation with a 4-level phase plate and an amplitude-modulated SLM. We implement this complex amplitude modulator system in classical 4f system and use this system to realize highly precise convolution to verify its feasibility. The optical convolution accuracy is higher than the phase-only modulator or the amplitude-only modulator method. We then incorporate this system with a one-layer CNN as its convolutional layer to accomplish a handwriting recognition inference, the image classification accuracy is also comparable to all-electrical result with the same framework.
11898-60
Author(s): Han Ouyang, Jia Yu, Huiping Liu, Buyu Guo, Ocean Univ. of China (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Show Abstract + Hide Abstract
In this paper, digital in-line holography technology is applied to image the large-scale flow field. Moreover for reconstructing the 3D flow field from digital holograms with high-speed and High accuracy, Convolutional Neural Network is applied to extract the 3D distribution of particles from holograms directly, the 3D trajectory of particles is also analyzed. Using the experiment system that we developed, the spatial distribution and internal dynamic movements of the plume and turbulence is reconstructed and calculated, and the interaction of turbulence with salinity along with time is studied. The experiment results have shown that the salinity difference has a linear relationship with the plume flux.
11898-61
Author(s): Yunpeng Liu, Chenqing Wang, Tao Jing, Xingpeng Yan, The Academy of Armored Forces Engineering of PLA (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Holographic stereogram opens up a new way for holographic 3D display of objects, and has high research value and significance in commercial, military and other aspects. In order to write real and virtual 3D scenes in holographic stereogram at the same time, so as to achieve the display effect of augmented reality, a light field fusion method is proposed. The basic principle of light field fusion is introduced. The light field sampling is introduced and completed, and DIBR algorithm is applied for regularization and densification of sampled images. The projection relationship of the light rays are analyzed, and the pixel level light field fusion is accomplished. EPISM holographic stereogram printing method is used to write and reproduce the fused light field which further verifies the effectiveness of the proposed method.
11898-63
Author(s): Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Show Abstract + Hide Abstract
We used holographic method to generate a fringe pattern whose period and phase can be easily modulated. First, a black and white fringe pattern with a certain spatial frequency is generated according to the cosine structured light period and phase. A prism phase is applied to the black part of the black and white stripes, so that the light incident on the black area deviates from the optical axis to the first order of diffraction. In this way, the deviated beam is bright and dark, and finally structured illumination is obtained. Theories and experiments verify the effectiveness of the method.
11898-64
Author(s): Zouhua Chen, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Show Abstract + Hide Abstract
We propose an optimization method to eliminate the influence of conical concave acoustic lens on beam transmission. A calibration mirror is added to the acoustooptic coupling prism with conical concave acoustic lens at the bottom, and the deterioration of the cone concave acoustic lens to the beam transmission is eliminated by optimizing the surface shape and thickness of the calibration mirror by Zemax. The optimization effect is evaluated by analyzing the spot. The simulation results show that the optimization method can eliminate the influence of the conical concave acoustic lens on the beam transmission, make the focal point and the focal point keep the coaxial focus, and improve the detection efficiency of the photoacoustic signal. This work is of theoretical significance for the systematic study of large depth of field photoacoustic microimaging.
11898-65
Author(s): Weiping Wan, Hang Feng, Sheng Ye, Qihuang Gong, Yan Li, Peking Univ. (China)
On demand | Presented Live 11 October 2021
11898-66
Author(s): Peiyuan Liu, Jiao Bai, Qian Zhou, Gaopeng Xue, Xiaohao Wang, Xinghui Li, Tsinghua Univ. Shenzhen International Graduate School (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11898-67
Author(s): Jiao Bai, Xiaohao Wang, Kai Ni, Qian Zhou, Xinghui Li, Tsinghua Univ. Shenzhen International Graduate School (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11898-68
Author(s): Runze Li, Tong Peng, Chen Bai, Meiling Zhou, Baoli Yao, Xi'an Institute of Optics and Precision Mechanics (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Show Abstract + Hide Abstract
Optical memory effect (ME) is a fundamental property for imaging through scattering or looking around corners. For dynamic turbid media the situation becomes much more complicated and experimental study on the angular ME (AME) of such dynamic turbid media were still lacked. The key for experiment of AME range of dynamic turbid media is to detect the correlated speckles faster than its decorrelation time. Here we presented a dual-polarized speckle detection setup and performed experimental studies on AME of dynamic turbid media such as milk. Finally, we designed a single shot holography based wavefront shaping system, and realized imaging through the turbid milk.
11898-69
Author(s): Zhelun Shen, Guanglin Yang, Peking Univ. (China); Haiyan Xie, China Science Patent & Trademark Agent Ltd. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
We propose an attention-based deep convolutional neural network for computer generated hologram (CGH) compression, where a channel attention mechanism is applied to both computer generated hologram compression and reconstruction. By applying deep convolutional neural networks in the compression process, we can extract more compact and representative information than bicubic interpolation. Additionally, a channel attention mechanism is applied to selectively emphasize informative features and suppress less useful ones for both CGH compression and reconstruction. By employing attention mechanisms to enhance the feature representation ability of deep convolutional neural networks, we can further improve the performance of the reconstructed computer generated hologram. Experimental results show our method can better recover the compressed computer generated hologram than only employing convolutional neural networks in the reconstruction process.
11898-70
Author(s): Jingyuan Ma, Guanglin Yang, Peking Univ. (China); Haiyan Xie, China Science Patent & Trademark Agent Ltd. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
A method for compressing computer-generated holograms (CGHs) using genetic algorithm optimized quantum-inspired neural network is proposed. Genetic algorithm is a global optimization algorithm, which can provide better initial weights for the quantum-inspired neural network. The global optimization ability of genetic algorithm is combined with the local optimization ability of the quantum-inspired neural network enables the network to achieve better convergence effects. Under different compression ratios, CGHs are compressed by the genetic algorithm optimized quantum-inspired neural network and the quantum-inspired neural network respectively, and Fresnel transform technology is used to reconstruct the decompressed CGHs. The experimental results show that the genetic algorithm optimized quantum-inspired neural network can obtain better quality reconstructed images than the quantum-inspired neural network while using fewer learning iterations.
11898-71
Author(s): Zongqing Wu, Quan Liu, Jinchao Lu, Nenghua Zhou, Soochow Univ. (China); Bin Huang, Soochow Univ. (China), Collaborative Innovation Ctr. of Suzhou Nano Science and Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
In this paper, the quartz immersed grating was designed for weak CO2 band. The rectangular groove structure with high refractive index dielectric film was designed in consideration of possible fabrication errors. At 1.595~1.625μm band, duty cycle is 0.3~0.45, groove depth is 560~640 nm, and TiO2 thickness is 110~120 nm, the diffraction efficiency of the grating is higher than 70%. When the duty ratio is 0.35, groove depth is 560~660nm, and the thickness of TiO2 is 120~130nm, the diffraction efficiency can reach more than 80%. When the duty cycle is 0.4, groove depth is 580~680nm, and the thickness of TiO2 is 100~120nm, the diffraction efficiency can reach more than 80%.The immersed grating with the period of 697nm in a quartz substrate of 245 mm x 138mm will be fabricated by holographic lithography - ion beam etching in late 2021. The TiO2 film will be deposited by atomic layer deposition.
11898-72
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China), Science and Technology on Electro-optic Control Lab.. (China); Quanxin Ding, Ronggang ZHU, Science and Technology on Electro-optic Control Lab.. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Computational imaging opens a new way for imaging solutions of complex systems from the information generation and transmission level. Based on the modeling of super-resolution technology, computational power is introduced into traditional imaging, aiming to break through the limitations of this kind of photoelectric information processing,the available configurations which spaced from single sensor to composite sensors is explored. Therefore,The global optimization and complex structured control method are fully used to solve the adaptive design problem of composite linear compensation with the multi- configuration systems. And the resolution of the criterion group can demonstrate that the systems is significantly improved, which can be used as an important basis for engineering application.
11898-73
Author(s): Xin Qian, Lingyu Ai, Jiangnan Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11898-75
Author(s): Grigoriy Greisukh, Evgeny Ezhov, Artem I. Antonov, Penza State Univ. of Architecture and Construction (Russian Federation)
On demand
Show Abstract + Hide Abstract
The harmonic sawtooth microstructure allows the diffractive lens to operate with polychromatic radiation, in particular, with the radiation of RGB LEDs, but only with restrictions due to axial color and specific field curvature. Its reason is the jump in the working diffraction order with an increase of the wave angle of incidence. The permissible wave angles of incidence at the microstructure were estimated using the example of a harmonic diffractive lens made of crown-like plastic E48R.
11898-76
Author(s): Changhyun Kim, Jongwoo Hong, Byoungho Lee, Seoul National Univ. (Korea, Republic of)
On demand
Show Abstract + Hide Abstract
As an increased demand in high resolution display, the pixel size in the image sensor is reduced to increase the resolution. Although there have been recent studies on metasurface color routers to overcome the limitation of the conventional image sensor, there are still limitations in that the designed devices do not show the advantages of router or are difficult to fabricate. In this study, the fabricable metasurface that distribute three visible wavelengths to each targeted color sensor is proposed numerically. For the distribution like the Bayer pattern, a dual focal phase profile is utilized for green color. The designed metasurface size is 2 μm by 2 μm, and the routing efficiencies are 12 %, 25 %, and 30 % for 473 nm, 532 nm, and 660 nm, respectively, where the performance in red light exceed the fundamental limit of efficiency of the conventional Bayer color filter array.
11898-77
Author(s): Paz Victoria T. Ramos, Ateneo de Manila Univ. (Philippines); Raphael A. Guerrero, Ateneo de Manila Univ. (Philippines), Isabela State Univ. (Philippines)
On demand
Show Abstract + Hide Abstract
Our current work discusses an alternative cost-effective method for producing elliptical zero-order Bessel beams with a simple optical system based on a commercially available transmission grating. A zero-order Bessel beam is made to pass through a diffraction grating with a groove density of 600 lines per mm. An elliptical Bessel beam intensity profile is obtained with the 1st-order (m = 1) diffracted beam when the grating is rotated about an axis parallel to the grating vector. For a grating tilted by 20 deg from the vertical, non-diffraction of the elliptical Bessel beam is observed over a propagation range from 10 to 95 cm with an average core diameter of 404 um. The elliptical Bessel beam at m = 1 has an eccentricity of 0.6 for a grating tilt of 20 deg.
Session 6: Holographic Microscopy
In person: 11 October 2021 • 14:30 - 17:20 China Standard Time
Session Chair: Liyong Ren, Shaanxi Normal Univ. (China)
11898-22
Author(s): Zi Wang, Hefei Univ. of Technology (China); Kefeng Tu, Hefei university of technology of China (China); Xu Zhang, Guoqiang Lv, Qibin Feng, Hefei Univ. of Technology (China); Hai Ming, Anting Wang, Univ. of Science and Technology of China (China)
On demand | Presented Live 11 October 2021
11898-23
Author(s): Gaopeng Xue, Qihang Zhai, Liyu Lin, Qian Zhou, Kai Ni, Xiaohao Wang, Xinghui Li, Tsinghua Univ. (China)
In person: 11 October 2021 • 15:00 - 15:20 China Standard Time
11898-24
Author(s): Rujia Li, Liangcai Cao, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
Tea/Coffee Break 15:40 - 16:00
11898-25
Author(s): Yunhui Gao, Liangcai Cao, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
The imaging quality of inline digital holography is challenged by the twin-image artefact because the phase retrieval problem is severely ill-conditioned. Sparsity-promoting regularizers such as the total variation (TV) seminorms have been explored to tackle the ill-posedness and proved effective in modeling real-world objects. However, previous works are mainly based on the TV seminorms for real-valued images, which limit their application in digital holography where we are often dealing with complex-valued signals. In this work, we introduce the complex constrained TV regularizers and propose an efficient proximal gradient algorithm for solving the phase retrieval problem. The proposed complex TV model and the corresponding algorithm are verified by numerical and experimental results. We believe that the proposed algorithmic framework can cast new light on solving a large class of optimization problems based on complex constrained TV regularization.
11898-27
Author(s): Zhiyun Huang, Ayuan Lin, Jinyu Wang, Fujian Normal Univ. (China); Xiaodi Tan, Fujian Normal Univ (China)
In person: 11 October 2021 • 16:20 - 16:40 China Standard Time
Show Abstract + Hide Abstract
How to retrieve correctly the recorded data in the material is a key issue for polarization holography. Also, it is the foundation of optical data storage, imaging, display, and mirco-nano processing, etc. When the polarization state of reconstructed wave is the same as that of signal wave, the recorded data may be retrieved correctly. That is the faithful reconstruction. In general case, the faithful reconstruction depends on the exposure time, which limits its application greatly. Based on the newly developed tensor polarization holography theory, we find that in some particular case, the faithful reconstruction is independent of the exposure time. We design the experiment and confirm the aforementioned result.
11898-28
Author(s): Kaicheng Yu, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 16:40 - 17:00 China Standard Time
Show Abstract + Hide Abstract
Tthis paper proposes photoacoustic microscopy based on single-pixel imaging to realize a wide-field imaging without sacrificing the stability of the system. This method is based on the principles of photoacoustic imaging and Fourier single pixel imaging. According to the principle of Fourier single-pixel imaging, any image is a weighted superposition of a sequence of cosine stripes of different spatial frequencies, and the weight coefficients of these stripes can be obtained to reconstruct the image. Therefore, a series of spatial frequency stripes are used to illuminate the sample, and the photoacoustic signal obtained by a single ultrasonic transducer is the Fourier spectral coefficient of the structure information corresponding to the spatial frequency, all the Fourier spectral coefficients are obtained, and finally the inverse Fourier transform to obtain high-resolution images.
11898-29
Author(s): Teng Ma, Chao Liu, Yuhong Wan, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
Show Abstract + Hide Abstract
Interferenceless coded aperture correlation holography (I-COACH) is a recently developed technique for indirect 3D imaging without two-wave interference. The CPM calculated using G-S algorithm plays an important role in I-COACH system. However there are some problems with GS algorithm, such as poor convergence and cannot constrain the intensity, thus leading to noise accompany in the reconstructed images. We introduce a modified G-S algorithm to I-COACH in this work to optimize the CPM and enhance the reconstruction images quality. The results show that both the PSH and OH recorded with optimization CPM have lower noise and the reconstructions have better imaging quality.
11898-32
Author(s): Alok K. Gupta, Naveen K. Nishchal, Indian Institute of Technology Patna (India)
On demand
Show Abstract + Hide Abstract
Transport of intensity equation (TIE) is a non-interferometric and non-iterative quantitative phase imaging technique that utilizes multiple intensity recordings along the propagation direction. Apart from many advantages, it has some experimental and numerical challenges as well. The experimental challenge is the requirement of multiple intensity recordings which prohibit TIE for real-time imaging of dynamic samples. The numerical challenge is to work with boundary conditions in post-processing analysis. It is required because phase information is to be retrieved after solving second order partial differential equation relating the intensity derivative with phase. In recent years, we have worked on solving the experimental challenges such as alleviating the need of multiple intensity recordings along-with some applications of TIE.
11898-33
Author(s): Aleksey V. Chernykh, Aleksei S. Ezerskii, Alexandra O. Georgieva, Nikolay V. Petrov, ITMO Univ. (Russian Federation)
On demand
Show Abstract + Hide Abstract
In this paper, we present the result of our study on the development of the digital holographic microscope with a geometric phase lens and the parallel phase-shifting polarization camera. In numerical simulation and the experiment, it was shown that in this configuration, the geometric phase lens leads to a shear interference pattern formation, thus causing an overlapping diffraction order in the reconstructed image and additional modulating phase term. Possible strategies to compensate for this phase term are discussed.
Session 7: Deep-Learning for Computational Imaging
In person: 12 October 2021 • 08:30 - 10:20 China Standard Time
Session Chair: Chao Zuo, Nanjing Univ. of Science and Technology (China)
11898-34
Author(s): Guohai Situ, Fei Wang, Xiangyu Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
In person: 12 October 2021 • 08:30 - 09:00 China Standard Time
11898-35
Author(s): Hangying Zhang, Liangcai Cao, Feng Yang, Tsinghua Univ. (China)
In person: 12 October 2021 • 09:00 - 09:20 China Standard Time
Show Abstract + Hide Abstract
The performance of the imaging system under extremely low light intensity will be affected by shot noise, and the shot noise will become stronger as the power of the light source decreases. However, most of the traditional Retinex model-based methods require careful design of constraints and parameters to deal with this highly ill-conditioned decomposition. When dealing with different scenarios, these constraints and parameters may be limited by the capabilities of the model. We applied the principle of deep learning to the problem of low-light image enhancement in the Retinex model, and proved that in terms of equivalent signal-to-noise ratio, the use of deep neural networks to restore objects under low-light illumination has better performance than traditional methods. Meanwhile, we propose to use compressed sensing technology to improve the signal-to-noise ratio of low-light-level images, and further increase the generalization ability of the network.
11898-36
Author(s): Xiangyu Zhang, Fei Wang, Guohai Situ, Shanghai Institute of Optics and Fine Mechanics (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
Deep neural networks have been successfully applied to constrained object priors and parameter optimization. Here, we propose a novel learning-free deep neural network architecture to tackle uncertain system optimization. This blind system constraint deep neural network(BlindNet) need not to know all the parameters of the system and can simultaneously acquire the desired image and system parameters. In order to do so, we showed that the BlindNet can perform phase retrieval on the diffraction pattern with unknown diffraction distance.
11898-37
Author(s): Xin Qian, Hao Ding, Fajing Li, Shouping Nie, Caojin Yuan, Shaotong Feng, Nanjing Normal Univ. (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
Deep learning (DL) can transform amplitude images into quantitative phase images directly. To obtain high-resolution phase images with large FOV, we propose a DL-enabled super-resolved quantitative phase imaging method (AF-SRQPI) to transform out-of-focus low-resolution amplitude images into super-resolved phase images. In the training process, out-of-focus low-resolution amplitude images and corresponding super-resolved phase images obtained by structured illumination digital holographic microscopy (SI-DHM) are used as the inputs and ground truth labels respectively. Comparing with other DL-based reconstruction schemes, the proposed method can perform autofocusing and super-resolved imaging simultaneously.
11898-38
Author(s): Meiling Zhou, Chen Bai, Xi’an Institute of Optics and Precision Mechanics (China); Yang Zhang, Shaanxi Normal Univ. (China); Runze Li, Tong Peng, Jia Qian, Dan Dan, Junwei Min, Yuan Zhou, Xi’an Institute of Optics and Precision Mechanics (China); Baoli Yao, Xi’an Institute of Optics and Precision Mechanics (China), Univ. of Chinese Academy of Sciences (China)
In person: 12 October 2021 • 10:00 - 10:20 China Standard Time
11898-39
Author(s): Yanmin Zhu, Tianjiao Zeng, The Univ. of Hong Kong (Hong Kong, China); Kewei Liu, Zhenbo Ren, Northwestern Polytechnical Univ. (China); Chok Hang Yeung, Edmund Y. Lam, The Univ. of Hong Kong (Hong Kong, China)
On demand
Show Abstract + Hide Abstract
Water scattering is an important limitation of the underwater imaging quality, which will change the transportation direction of the original light path, cause the attenuation of light intensity, and so on. In this paper, we use a synthetic polarizing camera to capture the images with different polarization states and reduce the impact of water scattering in one step with the underwater light propagation model and the Stokes vector. In addition, an untrained deep network is designed to complete the image de-scattering processing. Compared with the methods based on deep learning or physical model prior, it is more time-saving and efficient. This technology is suitable for using portable underwater imaging optical systems for real-time imaging and detecting particulate matter such as microplastics and microbial particles. It also broadens the application of underwater polarization imaging.
Break
Tea/Coffee Break 10:20 - 10:50
Session 8: Novel Techniques
In person: 12 October 2021 • 10:50 - 12:10 China Standard Time
Session Chair: Guohai Situ, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
11898-40
Author(s): Changsi Peng, Soochow Univ. (China)
In person: 12 October 2021 • 10:50 - 11:20 China Standard Time
Show Abstract + Hide Abstract
A unique novel molecular beam epitaxy (MBE) system was combined with in-situ laser interference patterning (isLIP-MBE). A new approaching to grow defect-free site-controlled InAs/GaAs quantum dot arrays (QDAs) has been demonstrated by isLIP-MBE. Indium atoms are selectively desorbed away from the GaAs substrate at sites of high light intensity generated by isLIP during MBE growth, encouraging selective nucleation and resulting in the highly controllable periodic formation of two dimensional defect-free QDAs. It combines the top-down isLIP with the capabilities of bottom-up structuring by self-assembly, to provide a cost-effective state of the art capability for next generation ordered QSAs. The resulting arrays will have unprecedented site and dimensional control and will be free of process defects.
11898-41
Author(s): Baoli Li, Xinyuan Fang, Min Gu, Univ. of Shanghai for Science and Technology (China)
In person: 12 October 2021 • 11:20 - 11:50 China Standard Time
Show Abstract + Hide Abstract
A main driving force of diffraction-free beams is the varied significant applications covering particle manipulation, plasmons, laser filamentation, optical bullets and super-resolution imaging. As an important branch of information optics, optical holography has been identified as a vital platform for displays, optical encryption, microscopy and artificial intelligence through different physical dimensions. However, the working length of present holography is limited in the Fourier plane (i.e. focal plane of the Fourier transformation lens) due to Huygens-Fresnel diffraction law, which causes a small depth of focus (DOF) of the holographic systems failing of three-dimensional (3D) holography. In this talk, we demonstrate diffraction-free optical holography. Our results pave an unprecedented way to achieve the propagation-distance-insensitive, oriented and obstacle-free optical holography.
11898-42
Author(s): Wei Zhang, Yanxiu Jiang, Zhongming Zheng, Tong Zhang, Zhendong Chi, Wenhao Li, Changchun Institute of Optics, Fine Mechanics and Physics (China)
In person: 12 October 2021 • 11:50 - 12:10 China Standard Time
11898-43
Author(s): Kedar Khare, Indian Institute of Technology Delhi (India)
On demand
Show Abstract + Hide Abstract
From a practical point of view, single-shot phase microscopy systems have several hardware advantages in terms of deploying them for applications, e.g. at clinical sites. The problem of recovering full diffraction-limited phase information from single-shot image plane holograms is however not straightforward as the solution is not unique. Our work over the last several years shows that image sparsity ideas incorporated into hologram demodulation algorithms can effectively surpass several long-held limits on phase imaging performance in terms of resolution and accuracy. Our efforts in converting these algorithmic ideas into a microscope device and diagnostic application development will be covered briefly.
Break
Lunch Break 12:10 - 13:40
Session 9: Grating Fabrication
In person: 12 October 2021 • 13:40 - 14:40 China Standard Time
Session Chair: Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
11898-44
Author(s): Min Han, Gaopeng Xue, Qian Zhou, Xiaohao Wang, Xinghui Li, Tsinghua Univ. (China)
In person: 12 October 2021 • 13:40 - 14:00 China Standard Time
11898-45
Author(s): Qihang Zhai, Gaopeng Xue, Liyu Lin, Qian Zhou, Kai Ni, Xiaohao Wang, Xinghui Li, Tsinghua Univ. (China)
On demand | Presented Live 12 October 2021
11898-46
Author(s): Haipeng Liu, Shanqin Zhuang, Shuo Yuan, Yishu Chen, Jijun Feng, Univ. of Shanghai for Science and Technology (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
A compact asymmetrical directional coupler composed of 70-nm-deep shallow etched dual grating structure waveguide and a 7.4-μm long coupling length, is proposed and fabricated to realize a broadband and high-extinction-ratio polarizing beam splitter. By carefully optimizing the structural parameters, the cross-coupling for TM light can be realized while little coupling happens for TE wave, which would have a broad application prospect for silicon-based photonics.
Session 10: Optical Computing
In person: 12 October 2021 • 14:40 - 15:30 China Standard Time
Session Chair: Kehan Tian, Jiaxing Yuguang Technology Development Co., Ltd. (China)
11898-47
Author(s): Changhe Zhou, Junjie Yu, Guowei Li, Guoqing Ma, Shanghai Institute of Optics and Fine Mechanics (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
This paper presented a roadmap of optical computing, particularly, for optical implementation of convolution in the coming years
11898-48
Author(s): Guoqing Ma, JunJie Yu, Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
In person: 12 October 2021 • 15:10 - 15:30 China Standard Time
Break
Tea/Coffee Break 15:30 - 16:00
Session 11: Holographic Applications
In person: 12 October 2021 • 16:00 - 17:20 China Standard Time
Session Chair: Liangcai Cao, Tsinghua Univ. (China)
11898-49
Author(s): Jian Chen, Univ. of Shanghai for Science and Technology (China); Qi Yao, Henan Agricultural Vocational College (China); Jijun Feng, Dawei Zhang, Univ. of Shanghai for Science and Technology (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
Bragg hollow-core PMMA tube waveguides with varying grating structures were theoretically and experimentally investigated for the terahertz (THz) chemical material sensor applications. Compared with single-layer tube, the multi-layer Bragg cases can produce a delayed response in the time domain with an improved extinction ratio. A double tube combination consisted of a thick double-groove chirped grating tube and a thin single-groove chirped grating one can realize an improved detection sensitivity. With different extinction ratio of the measured THz spectra, ethanol and vinegar can be distinguished with a sensitivity of about 18 dB/mL. The proposed multi-layer hollow-core grating waveguide can be further applied for the THz gas sensing applications.
11898-50
Author(s): Kehan Tian, Jiaxing Yuguang Technology Development Co., Ltd. (China)
In person: 12 October 2021 • 16:30 - 17:00 China Standard Time
11898-51
Author(s): Yang Chen, Lin Lu, Xue Wu, Jia Zhang, Chao Zuo, Nanjing Univ. of Science and Technology (China)
On demand | Presented Live 12 October 2021
Show Abstract + Hide Abstract
In traditional lensless in-line holographic microscopy, phase recovery based on multi-defocus distance is a common pixel-super-resolution technique. This method usually requires accurate displacement as a predictive condition, and the introduction of a precision mechanical displacement platform can bring about accurate displacement, but makes a simple lensless system complicated and expensive. In this paper, the samples are illuminated by a nearly coherent illumination system, and holograms at different heights are captured by the sensor driven by a low-cost servo motor without feedback system. Inaccurate displacement interval results in poor phase recovery. We propose a multi-height phase recovery algorithm based on z-axis correction to recover the phase information of the sample, which can improve the result by 1.58 times compared with that before correction. The reconstruction USAF target demonstrates a half-pitch lateral resolution of 775 nm across a large field-of-view of ∼29.84 m
11898-52
Author(s): Chi Man Woo, Qi Zhao, Zhipeng Yu, Puxiang Lai, The Hong Kong Polytechnic Univ. (Hong Kong, China)
On demand
Show Abstract + Hide Abstract
We propose a hybrid algorithm based on genetic algorithm (GA) and ant colony optimization (ACO) for optical focusing inside/through scattering media. The hybrid algorithm has the basic structure of a GA, where the offspring generation procedures (i.e., parent selection and crossover) are replaced by the path generation procedures in ACO. The GA-ACO is advantageous by the rapid discovery of good solutions from ACO and enhanced solution diversity from GA. Therefore, the algorithm has a strong ability to search for a global optimal solution quickly, and experimentally we can achieve optimization results approaching the theoretical optimum.
Conference Chair
Univ. Laval (Canada)
Conference Chair
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
Conference Chair
Tsinghua Univ. (China)
Program Committee
Soochow Univ. (China)
Program Committee
Min Gu
Univ. of Shanghai for Science and Technology (China)
Program Committee
Utsunomiya Univ. Ctr. for Optical Research & Education (Japan)
Program Committee
Seoul National Univ. (Korea, Republic of)
Program Committee
Ai Qun Liu
Nanyang Technological Univ. (Singapore)
Program Committee
Zhejiang Univ. (China)
Program Committee
Shenzhen Univ. (China)
Program Committee
Virginia Polytechnic Institute and State Univ. (United States)
Program Committee
Beijing Univ. of Posts and Telecommunications (China)
Program Committee
National Central Univ. (Taiwan, China)
Program Committee
Fujian Normal Univ. (China)
Program Committee
Peter W.M. Tsang
City Univ. of Hong Kong (Hong Kong, China)
Program Committee
Saint Petersburg Electrotechnical Univ. "LETI" (Russian Federation), Saint Petersburg State Univ. (Russian Federation)
Program Committee
Soochow Univ. (China)
Program Committee
Xi'an Institute of Optics and Precision Mechanics of CAS (China)
Program Committee
Utsunomiya Univ. Ctr. for Optical Research & Education (Japan)
Program Committee
Shenzhen Univ. (China)
Program Committee
Capital Normal Univ. (China)
Program Committee
Northwestern Polytechnical Univ. (China)
Additional Information

CLOSED


this conference is no longer accepting abstract submissions.

POST-DEADLINE ABSTRACT SUBMISSIONS

  • Submissions were accepted through 30-August
  • Notification of acceptance by 6-September

View Call for Papers PDF