The SPIE/COS Photonics Asia 2021 conference on Plasmonics will bring together plasmonics experts from across the globe, both junior and senior, from academia and industry, to share their latest results and set the agenda for future developments in the field.

Papers are solicited on the following and related topics: ;
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Conference 11904

Plasmonics VI

In person: 10 - 11 October 2021
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  • Opening Ceremony and Plenary Session I
  • 1: Light-Matter Interaction
  • Plenary Session II
  • 2: Metallic Nanostructures and Applications
  • 3: Metastructures and Device Applications
  • 4: Plasmonic Nonlinear Optics
  • Poster Session
  • 5: Nanophotonics and Applications
  • 6: Optoelectronics and 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
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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
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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
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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: Light-Matter Interaction
In person: 10 October 2021 • 13:30 - 15:00 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-1
Author(s): Fajun Xiao, Northwestern Polytechnical Univ. (China)
On demand | Presented Live 10 October 2021
11904-2
Author(s): Yingcui Fang, Hefei Univ. of Technology (China)
In person: 10 October 2021 • 13:55 - 14:20 China Standard Time
11904-3
Author(s): Fajing Li, Fengyan Gu, Liqi Ding, Hao Ding, Shaotong Feng, Shouping Nie, Caojin Yuan, Nanjing Normal Univ. (China)
On demand | Presented Live 10 October 2021
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We propose a method generate phase tunable multi-ring perfect optical vortices (MR-POVs) where each ring size is independent of its OAM and possesses same topological charge value. The scheme is based on the radical discontinuous spiral phase plate (RD-SPP) which introduces controllable phase jumps along radial direction. It is experimentally demonstrated that the the intensity ratio and angular phase distrubution between each ring can be freely regulated of the integer and fractional MR-POV by the independent regulation of angular and radial factors. This work expands our understanding of multi-ring POV and provide a new idea for optical tweezers and OAM communications.
11904-4
Author(s): Yuchen Dai, Pengfei Qi, Yang Luo, Peking Univ. (China); Guangyi Tao, Nankai Univ. (China); Liheng Zheng, Bo Shen, Feng Lin, Zheyu Fang, Peking Univ. (China)
In person: 10 October 2021 • 14:45 - 15:00 China Standard Time
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Phonon-assisted upconverted emission lies at the heart of energy harvesting, bioimaging, optical cryptography and optical refrigeration. It has been demonstrated that the emerging two-dimensional (2D) semiconductors can provide a great platform for efficient phonon-assisted upconversion. However, the research on the further enhancement of excitonic upconverted emission in 2D semiconductors is almost blank. Here we report the enhanced multiphoton upconverted emission of 2D excitons in doubly resonant plasmonic nanocavity. The upconverted emission amplification of >1000 folds and the decrease of 2 ~ 3 orders of magnitude for saturated excitation energy density are achieved. These findings pave the way to the development of excitonic upconversion lasing, nanoscopic thermometry and sensing, and open up the possibility of optical refrigeration in future 2D electronic or excitonic devices.
Break
Tea/Coffee Break 15:00 - 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
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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: Metallic Nanostructures and Applications
In person: 10 October 2021 • 16:30 - 18:05 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-6
Author(s): Chengbing Qin, Shanxi Univ. (China)
In person: 10 October 2021 • 16:30 - 16:55 China Standard Time
11904-7
Author(s): Huakang Yu, South China Univ. of Technology (China)
In person: 10 October 2021 • 16:55 - 17:20 China Standard Time
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Microlasers with reduced dimension, favorable tunability and high-Q factor, have promising applications for on-chip optical communication, sensing and information processing. Especially, cavity mode manipulation is dispensable so as to achieve either single mode operation or wavelength switch. In this talk we will introduce the successful cavity mode manipulation of a bottle microresonator simply by depositing single gold nanoparticles. Such micrometer-scale bottle microresonators usually exhibited multi-mode lasing behavior. By precise positioning of gold nanoparticles onto microresonator surface, we could efficiently manipulate cavity modes in a reconfigurable and tunable manner. To demonstrate this simple method, we achieved single mode lasing with a high side-mode suppression factor of approximately 13 dB.
11904-8
Author(s): Zhibo Dang, Zheyu Fang, Peking Univ. (China)
In person: 10 October 2021 • 17:20 - 17:35 China Standard Time
11904-9
Author(s): Lufang Liu, Xin Guo, Limin Tong, Pan Wang, Zhejiang Univ. (China)
In person: 10 October 2021 • 17:35 - 17:50 China Standard Time
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We study the optical response of nanorod on mirror structure both experimentally and theoretically. The strong coupling of a gold nanorod with an atomically flat gold mirror produces rich and high-quality plasmonic modes related to complex interaction of film-coupled nanorod modes and waveguide modes in the gap. Their optical responses are very sensitive to the thickness and refractive index of the dielectric spacer. High-quality nanorod-on-mirror nanocavities are attractive for studying light-matter interaction at the nanoscale, and promising for the construction of nanophotonic devices such as nanolasers and plasmon-enhanced sensors.
11904-10
Author(s): Wanling Wu, Huakang Yu, South China Univ. of Technology (China)
In person: 10 October 2021 • 17:50 - 18:05 China Standard Time
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Optical force plays a fundamentally important role in light–matter interactions. And optical force can be greatly enhanced in integrated photonic circuits in which light is highly concentrated at the subwavelength scale. Here we propose optical forces produced by the hybrid structure consists of a subwavelength-diameter (SD) silica fiber and a metallic nanosphere. Significant transverse optical forces have been identified, which are also strongly related to incident light polarizations. Both transverse force and the SD fiber deflections can be simultaneously controlled by changing the running conditions. It is expected that our findings provide an efficient microscale mechanical transducer in the photonics domain.
Session 3: Metastructures and Device Applications
In person: 11 October 2021 • 08:30 - 09:55 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-11
Author(s): Ru-Wen Peng, Jia-Nan Wang, Fang-Zhou Shu, Bo Xiong, Ben-Qi Hou, Ren-Hao Fan, Dong-Xiang Qi, Mu Wang, Nanjing Univ. (China)
In person: 11 October 2021 • 08:30 - 09:00 China Standard Time
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Phase change materials (PCMs), featuring various structural and electronic transitions, play an important role in realizing dynamically tunable metadevices. Owing to their large changes in optical properties, GeSbTe (GST) alloys and vanadium dioxide (VO2) have become the most common PCMs used for tunable optical metadevices. In this work, we present several dynamically-tuned active metasurfaces and plasmonic devices based on the phase transition of VO2, which include dynamically-tuned plasmonic color generators, infrared polarizers, optical nanoantennas, and even flexible active absorbers.
11904-13
Author(s): Zi-Lan Deng, Jinan Univ. (China)
On demand | Presented Live 11 October 2021
11904-14
Author(s): Liu Zhengchang, Zheyu Fang, Peking Univ. (China)
In person: 11 October 2021 • 09:25 - 09:40 China Standard Time
11904-15
Author(s): Xiangrong Wu, Peking Univ. (China)
In person: 11 October 2021 • 09:40 - 09:55 China Standard Time
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By taking advantage of Airy surface plamon polaritons (Airy SPPs) with ultralong propagation length, we change their coupling grating structure into the plamonic metasurface analogues, i.e., introduce the T-shaped nano-slits geometric phase units to replace the conventional grating. Through the metasurface coupling grating, the propagation direction of Airy SPPs can be controlled by excitation light polarization. Furthermore, controlling the meeting of two Airy SPPs by two structures, the constructive interference effect occurs, which continues to elongate their propagation length. Effectively exploiting SPP energy and manipulating its propagation could pave the way for ultraefficient flat optical devices.
Break
Tea/Coffee Break 09:55 - 10:30
Session 4: Plasmonic Nonlinear Optics
In person: 11 October 2021 • 10:30 - 11:50 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-16
Author(s): Benfeng Bai, Tong Cui, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
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Photonic spin-orbit interaction has attracted much attention in recent years. This talk first reports the efficient generation of ultra-compact optical vortex (OV) in achiral nanostructures, which has a radius of only 1 μm and possesses a signal-to-noise ratio larger than 6 dB. A spin-selective and phase-resolved scanning near-field optical microscope (SNOM) is employed to probe and visualize the OV generation process in the spin basis. Furthermore, a SNOM system is developed for probing and analyzing nonlinear optical signals in nanostructures with subwavelength resolution, which images the near-field third-harmonic generation from an anapole dark-mode state in a silicon nanodisk.
11904-17
Author(s): Botao Wu, East China Normal Univ. (China)
In person: 11 October 2021 • 11:00 - 11:25 China Standard Time
11904-18
Author(s): Fangqi Chen, Yong Liu, Wuhan Univ. (China); Xuezhi Zheng, KU Leuven (Belgium); Tao Ding, Wuhan Univ. (China)
In person: 11 October 2021 • 11:25 - 11:50 China Standard Time
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
11904-30
Author(s): Ming Zhang, Qian Cheng, Xiaoran Zhang, Baozhu Wang, Hebei Univ. of Science and Technology (China); Najiao Zhang, Hebei university of science and technology (China); Ze Ma, Cong Li, Hebei Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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The non-ionizing radiation and the high sensitivity to weak interactions of terahertz (THz) waves make THz technology a great applicability in the field of biosensing and medical detection. Besides, benefitted from the flexible capability of metasurface in manipulating the electromagnetic (EM) waves, the high-sensitivity THz sensors can be achieved to promote the development of THz sensing. However, the polarization dependence of hybrid-resonances-based metasurface and the single resonance cause the reduction in sensitivity, which is urgent to be settled. In this paper, we proposed a centrosymmetric metasurface to produce polarization-independent multiple resonances for improving the sensitivity of THz sensing. The advantage of transmitted structure and polarization-independent resonance can relief the difficulty of measurement. We believe these studies will promote the development of high-sensitivity THz biosensing.
11904-31
Author(s): Weidong Zhang, Hong Chiang, Te Wen, Lulu Ye, Hai Lin, Peking Univ. (China); Haitan Xu, University of Science and Technology of China (China); Qihuang Gong, Guowei Lu, Peking Univ. (China)
On demand | Presented Live 11 October 2021
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Coupled plasmonic systems are of great interest and have many applications such as information processing and sensing. By choosing proper geometric configurations of coupled plasmonic systems, one can obtain various optical properties. However, some interesting and important effects could not be described by earlier methods. We develop an improved method for coupled plasmonic nanoparticle systems that maps geometric configurations to optical properties more accurately. With the improved method, we realize a low-loss cavity of metallic nanoparticles through a proper geometric configuration, and we find a limit to the loss in the metallic nano-cavity. We also use this method to realize an exceptional point and exceptional nexus in a hybrid plasmonic system. Finally, we predict asymmetric coupling, which leads to chirality and directional energy transfer.
11904-32
Author(s): Lulu Ye, Aiqin Hu, Guowei Lu, Peking Univ. (China)
On demand | Presented Live 11 October 2021
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We investigated in situ the interaction between a single gold nanorod and monolayer transition metal dichalcogenides (TMDCs) by atomic force microscopy nanomanipulation and single-particle spectroscopy.We observed that the resonant scattering peak of the hybrid redshifted, the full width at half maximum of the scattering resonance narrowed and the scattering intensity increased compared with those of the same nanorod before coupling with monolayer TMDCs. These results were understood with the aid of finite-difference time-domain simulations, the Fano model, and the classical oscillator model. Also, the spectral features varied with the distance between the nanorod and TMDCs, and the interaction was mainly attributed to the resonant energy transfer effect. Our findings clarify the influence of TMDCs on the plasmonic resonance and contribute to a deeper understanding of the plasmon exciton interaction.
11904-33
AAS
Author(s): Airong Zhao, Liaocheng Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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A multifunctional compact which integrates a polarization beam splitter and an orbital angular momentum generator based on plasmonic nano-aperture assisted detour phase meta-hologram is introduced. The composed device combines phase singularity characterized fork pattern and polarization featured V-shaped antenna. Using far field method combined with polarization tomography analysis, this device is experimental and theoretical demonstrated by applying linear polarization incident beam. It shows circular polarized singular beams are achieved. It is expected to seek its applications in chip-level beam shaping and high-capacity communication.
11904-34
Author(s): Sun Peng, North Univ. of China (China); Xiaojian Hao, North Univ of China (China); Yanwei Yang, Yekun Liu, Wenyuan Hao, North Univ. of China (China); Yu Tian, North University of China (China)
On demand | Presented Live 11 October 2021
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In this paper, 8 kinds of standard soil samples are used, 2 grams of each were extracted and placed in a tableting mold, using a 20MPa hydraulic press to form a smooth sheet with a diameter of 30mm and a thickness of 3mm for use. The laser energy was set to 30mJ, and the pulse repetition frequency was set to 5Hz. Plasma spectral lines of metal element Mg of different samples were obtained through experiments, and linear PLS was used to model and analyze the original spectrum and the spectrum after baseline correction respectively. Experimental results show that the accuracy of LIBS quantitative analysis is greatly improved after baseline correction. After using the method described in this article for baseline correction, the coefficient of determination R2 increased from 0.9553 to 0.9858, and the root mean square error RMSEC decreased from 1.5610 to 0.8571. The accuracy of LIBS quantitative analysis has been significantly improved.
11904-35
Author(s): Sun Peng, North Univ. of China (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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11904-36
Author(s): Junyu Li, Yuwei Lu, Xuehua Wang, Sun Yat-Sen Univ. (China)
On demand | Presented Live 11 October 2021
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The strong interaction between several components forms the hybridized plexciton state and yields multiple Rabi splittings. We propose an integrated structure, J-aggregates molecular dye and monolayer WS2 wrap around the core-shell Au@Ag nanorods layer by layer, and realize an active-controlled strong exciton-plasmon-exciton coupling, resulting in three plexciton branches. We build a coupled oscillator model theory to describe the interaction, finely reproduce the derived scattering spectra by the finite-difference time-domain (FDTD) method. The amount of J-aggregates and the layer of WS2 can actively modulate the coupling strength between excitons and the localized surface plasmon resonances. The core-multishell structure is experiment-feasible for the unusual WS2 nutshell riches in defects state and protects J-aggregates from dye leakage and photobleaching. The multiple Rabi splittings and its dynamic control may have potential application in sensing and catalysis at the nanoscale.
11904-37
Author(s): Zhenlong Zhao, Boyu Ji, Xiaowei Song, Peng Lang, Yulu Qin, Jingquan Lin, Changchun Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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Accurately capturing the spatiotemporal information of surface plasmon polaritons (SPPs) is the basis for expanding SPPs applications. We record time-resolved nonlinear photoemission electron microscopy (TR-PEEM) images of weakly excited femtosecond SPPs launched from a rectangular trench milled into a flat silver film. Experimental results show that the overall photoelectron yield is greatly enhanced (typically 6-fold enhancement with the comparison of that without 400nm pulse) in this configuration. The spatiotemporal evolution of SPP can be easily investigated with its carrier wavelength, group velocityand phase velocity. The improvement of photoemission yield is interpreted by the quantum pathway for two-color with changing the nonlinear for photoemission. These findings complete the underlying physics of two-color PEEM optimized SPP spatiotemporal imaging.
11904-38
Author(s): Hanmin Hu, Jingquan Lin, Boyu Ji, Changchun Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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Realizing multiple beam shaping functions in a single plasmonic device is the key to realizing photonic integration. Surface Plasmon Polariton (SPP) Bessel-Like Beams and Bottle Beams have potential applications in nanophotonics, especially in near-field optical trapping, micro-manipulation, and on-chip interconnect circuits. Thus, it is very interesting to find new approaches for simultaneous generation of surface plasmon polariton Bessel-like beams and bottle beams in a single photonic device. The wavelength-manipulated Bessel SPP beam and Bottle beam emitters based on the combination of broadband directional elements and dichroic elements are designed.
11904-39
Author(s): Baixun Sun, Boyu Ji, Yulu Qin, Jingquan Lin, Changchun Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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The remote excitation based on the propagating surface plasmons (PSP) is becoming increasingly extensive. Here, we study the dynamics of the localized surface plasmons (LSP) remotely excited by PSP on the gold film using the finite-difference time-domain numerical simulations method. The results show that the spectra of LSP excited by PSP change along with its excitation location, showing a unique phenomenon that the spectra exhibit a redshift tendency compared to the LSP excited by the traditional laser source. By comparing with the dynamics of LSP excited by a laser source, the unique near-field characteristics of that excited by PSP can be obtained. Furthermore, we find that the dephasing time of LSP excited by the PSP is longer than by the traditional laser source. We believe the results of this study can be used to improve the efficiency of remote catalytic reactions and provide new ways to prolong the dephasing time.
11904-40
Author(s): Yuxi Xiao, Leiming Zhou, Wu Fei, Wei Qiu, Wei Zhang, Fei Wang, Zhili Wang, Jigang Hu, Hefei Univ. of Technology (China)
On demand | Presented Live 11 October 2021
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Strong and controllable circular dichroism (CD) is of great significance in enormous applications of life science. Here we have theoretically investigated the CD response in an Au split resonant ring (SRR)/graphene nano-ribbon arrays on a metal substrate. The circular dichroism (CD) intensity in the proposed structure can approach 50%. Our theoretical investigation indicate that the strong CD is arisen from the symmetry breaking with the longitudinal plasmonic coupling in this hybrid system. More interestingly, we find that the strong optical CD can be very robust to the change of geometrical parameters of SRR and graphene nanoribbon as well as their vertical separation. Our design provides a new route for developing the compact and robust optical chiral devices in application of biochemical sensing and optical communication.
11904-41
Author(s): Guowei Lu, Te Wen, Hai Lin, Weidong Zhang, Qihuang Gong, Peking Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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We demonstrate that a chiral plasmonic antenna consisting of two stacked gold nanorods can modulate strongly valley-polarized photoluminescence (PL) of monolayer MoS2 in a broad spectral range at room temperature. The modulated valley-polarized PL can reach up to ~47%, with approximately three orders of PL magnitude enhancement within the plasmonic nano-gap. Besides, the opposite circularly polarized light excitation exhibit different emission intensities and directivities in the far-field, which can be attributed to the modulation due to the chiral antenna both in the excitation and emission processes.
11904-42
Author(s): Fei Liang, Yongxiang Feng, Huichao Chai, Wenan Liao, Wenhui Wang, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
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Live cell microscopy technology, especially cell three-dimensional refractive-index reconstruction, is one of the important single-cell analysis methods, which can investigate subcellular organelles and biological mechanisms. Compared with the method of rotating the illumination light, rotating cells can obtain the complete internal structure information of the cell. However, cell rotation based reconstruction methods typically rotate cells in low operation throughput and image unstably in a low sensitivity. To bridge this gap, we demonstrate a combination strategy that uses acoustically oscillating bubble array based acoustofluidic device to simultaneously rotate cells in large-scale, and sets up a wDPM module to record cell quantitative phase maps with a high temporal and spatial phase sensitivity due to the common-path geometry and white light illumination. Result shows the phase accuracy of this system is less than 6.7%, the phase spatial consistency does not exceed 4%.
11904-43
Author(s): Shan Wu, Fuyang Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Monolayer transition metal dichalcogenides (TMDs) possess superior optical responses due to the special atomic structures, which can extend their intriguing applications in linear and nonlinear nanophotonics and optoelectronics. However, the atomic thickness of monolayer TMDs severely decreases the interaction length with free light with respect to bulk materials, leading to rather low photoluminescence (PL) and second-harmonic generation (SHG) conversion efficiency. Here, we demonstrate a hybrid structure consisting of a monolayer MoS2 on a suspended perforated silver film, on which the PL and SHG signal emitted from the monolayer MoS2 is enhanced by more than three orders of magnitude at room temperature. The pronounced PL and SHG enhancement is attributed to the distinct electric field amplification nearby the nanoholes, which is induced by the symmetric surface plasmon polaritons (SPPs) existing in the ultrathin suspended silver grating.
11904-44
Author(s): Fenghuan Hao, Pengfei Liu, Xincan Lou, Yue Wang, Hangzhou Applied Acoustics Research Institute (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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A hydrogen sensor based on a plasmonic structure is proposed, which emits dual directional beams and the beaming angle are sensitive to hydrogen gas. The plasmonic structure for hydrogen sensing consists of subwavelength slits surrounded by grooves in a sandwich multilayer film, where a Pd film sensitive to hydrogen is used as the top layer. By optimizing the parameters of grooves, the phases of SPPs scattering lights by grooves are controlled and the intensity patterns of transmitted light with dual directional beams are formed. With the appearance of hydrogen gas and the concentration increasing, the phases of lights emitting from grooves will change gradually, which leads to the change of the included angle between the two directional beams. A plasmonic structure for hydrogen sensing is designed and optimized, tthe beaming effect is observed and the relations between the included angle and the concentration are explored by simulations.
11904-45
Author(s): Zhiyuan Qian, Peking Univ. (China)
On demand | Presented Live 11 October 2021
11904-46
Author(s): Hua Liu, Science and Technology on Electro-optic Control Lab. (China)
On demand | Presented Live 11 October 2021
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Precision Imaging, as a challenging technology, is overcoming the limitation of space-time adaptability precisely, and imaging in the niche surrounding in tissues, blood flow fields and even nuclei of living organisms. The theoretical and engineering foundations are established for exploring the high-resolution visualization of biological micro-behavior and the comprehensive application of machine vision at the level of vivo conditions. The effect of system evaluated criterion that Modulation Transfer Function (Modulation Transfer Function, the MTF), Energy concentration (Radial Energy Analysis, REA), diffusion (Spot Diagram, RMS) and other aspects and other qualitative criteria can support our arguments. And the results can be used as basis for the development of new products.
11904-47
Author(s): Chenwei Sun, Yang Bu, Yuanhang Wang, Fang Wu, Yachao Cai, Shanghai Institute of Optics and Fine Mechanics (China); Xiangzhao Wang, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
On demand | Presented Live 11 October 2021
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System parameters are important factors that affect the spatial characteristics of LIBS spectral intensity. In this paper, a two-dimensional LIBS model is used to study the effects of laser incident angle and laser energy on the spatial characteristics of laser-induced plasma spectral intensity. In the research, the best laser incidence angle, the best spectrum detection angle of the system under different parameters are obtained. At the same time, the variation trend of the spectral intensity of laser plasma with the detection angle under different parameters is studied. Among them, the regular simulation results have been verified by experiments.
11904-48
Author(s): Huan Chen, Shaanxi Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11904-49
Author(s): Xiaohu Mi, Shaanxi Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In this study, we developed an efficient route for nanotip growth on Au nanostructures at room temperature. Importantly, we also solved the problem of surfactant removal by using a binary surfactant, i.e., hexadecyltrimethylammonium chloride/hexadecyltrimethylammonium bromide (CTAC/CTAB) instead of poly(vinylpyrrolidone), thiols, or biomolecules. Various Au nanoarchitectures were selectively synthesized by adjusting the CTAC/CTAB concentrations. Our synthetic method is simpler than the commonly used seed-mediated growth method. Furthermore, the Au nanoarchitecture nanotips give better EM and photothermal field enhancements because the light confinement is stronger. This method provides a new strategy for designing plasmonic nanostructures.
11904-50
Author(s): Guang Feng, Zhihui Chen, Taiyuan Univ. of Technology (China)
On demand | Presented Live 11 October 2021
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Terahertz (THz) absorbers have attracted considerable attention due to their potential applications. However, the limited bandwidth of THz absorbers limits their further applications. In order to achieve ultra-broadband and high absorption characteristics in the THz band, a double truncated pyramid unit structure combining the hybrid planar structure and the few-layers vertical structure is proposed. The double truncated pyramid unit structure composed of five metal layers and five graphene layers has the advantages of ultra-broadband, tunability, polarization-insensitive, wide-angle absorption. The simulation results show that the absorption coefficient of the absorber is greater than 0.9 from 1.49 THz to 12.72 THz, and the absorption bandwidth is 11.23 THz. The ultra-broadband absorption can be attributed to the size effect. The absorption mechanism can be further explained by surface current distribution and impedance matching theory.
11904-51
Author(s): Arturs Bundulis, Jelena Mikelsone, Institute of Solid State Physics, Univ. of Latvia (Latvia)
On demand
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In this work, we studied the nonlinear optical properties of core-shell silver nanoparticles with thiol-termination ligand cladding. Nanoparticles were synthesized in aqueous media by borohydride reduction of AgNO3 and dispersed in Dichloromethane. Solutions nonlinear optical properties were studied using the Z-scan method. Experimental measurements showed that for 27.5 ps pulse width two-photon absorption was observable in the range 700-900 nm. Approaching shorter wavelengths an increase of nanoparticle nonlinear refractive index was observed mainly due to the thermo-optical effect. Experimental measurements with 8 ns pulse width laser at different pulse repetition rate indicated thermal interaction between nanoparticles and solvent.
11904-52
Author(s): Anna V. Tcibulnikova, Natalya Myslitskaya, Vasily Slezhkin, Valery V. Bryukhanov, Ilia G. Samusev, Artemiy A. Khankaev, Maxim V. Demin, Ivan I. Lyatun, Immanuel Kant Baltic Federal Univ. (Russian Federation)
On demand
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In this paper, the plasmon resonance splitting on the anodized modified titanium has been studied. The plasmons absorption process in the permittivity functions spectra and reflectance spectra of p- and s-polarized light on the titanium oxide surface have been analyzed when the surface roughness parameters are changing. The surface roughness values were also estimated in this paper. Spectral features of the negative refractive index in the area of surface plasmon generation on the rough titanium-oxide film interface have been also presented in this paper. Surface roughness parameters are also determined. The upconversion luminescence enhancement of the ytterbium oxide on the rough titanium surface was observed in this work.
11904-53
Author(s): Igor Kon, Andrey Y. Zyubin, Immanuel Kant Baltic Federal Univ. (Russian Federation); Alexey Seteikin, Immanuel Kant Baltic Federal University (Russian Federation), Amur State University (Russian Federation); Ilia G. Samusev, Immanuel Kant Baltic Federal Univ. (Russian Federation)
On demand
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The paper describes the results of finite-difference time-domain (FDTD) mathematical modeling of electromagnetic field distortion near the surfaces of core-shell gold and silver-based nanorods (NRs). NRs were consistently functionalized by SiO2 shells of different thicknesses. The calculated field values were converted into the electromagnetic field enhancement coefficient and the theoretical surface-enhanced Raman scattering (SERS) intensity.
11904-54
Author(s): Artemiy A. Khankaev, Anna V. Tcibulnikova, Ilia G. Samusev, Ivan I. Lyatun, Immanuel Kant Baltic Federal Univ. (Russian Federation); Vasiliy Slezhkin, Kaliningrad State Technical Univ. (Russian Federation); Valery V. Bryukhanov, Immanuel Kant Baltic Federal Univ. (Russian Federation)
On demand
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This work presents the process of creating laser-induced surface structures by fs laser radiation with circular polarization and the study of their optical properties by ellipsometry method. This report presents SEM images of the Cu and Cu/Au surfaces and the studies of spectral features of dielectric permittivity function and reflection coefficients of s- and p-polarized light.
Session 5: Nanophotonics and Applications
In person: 11 October 2021 • 14:30 - 16:20 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-20
Author(s): MengFei Xue, Wenzhou Institute, Univ. of Chinese Academy of Sciences (China); Jianing Chen, Institute of Physics (China)
In person: 11 October 2021 • 14:30 - 15:00 China Standard Time
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A variety of infrared applications rely on semiconductor superlattices, including, notably, the realization of high-power, compact quantum cascade lasers. Requirements for atomically smooth interface and limited lattice matching options set high technical standards for fabricating applicable heterostructure devices. The semiconductor twinning superlattice (TSL) forms in a single compound with periodically spaced twin boundaries and sharp interface junctions and can be grown with convenient synthesis methods. Therefore, employing semiconductor TSL may facilitate the development of optoelectronic applications related to superlattice structures. Here, it is shown that InAs TSL nanowires generate inter-sub-band transition channels due to the band projection and the Bragg-like electron reflection. The findings reveal the physical mechanisms of inter-sub-band transitions in TSL structure and suggest that TSL structures are promising candidates for mid-infrared optoelectronic applications.
11904-21
Author(s): Wenhui Wang, Xi'an Jiaotong Univ. (China)
In person: 11 October 2021 • 15:00 - 15:25 China Standard Time
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Metal nanowires (NWs) can support surface plasmon polaritons (SPPs) propagating beyond light diffraction limit, which enables the miniaturizing of optical devices. However, the severe energy losses associated with SPPs propagation have largely hampered their applications in integrated nanophotonic devices. In this work, we find that the propagation loss on a thick Ag NW placed on a Si substrate can be prominently reduced. The statistic results illustrate that Si substrate exhibits the minimum energy loss among the three types of commonly used substrate (Si, SiO2/Si and glass). The mechanism can be attributed to the enhanced hybridization and mode splitting resulted from stronger interaction between nanowire plasmon and Si substrate, which can further reduce the ohmic loss and energy radiation into the substrate. Our findings demonstrate the advantages of Si substrate in supporting higher order plasmon modes, which are significant for the integration with Si-based electronic circuits.
11904-22
Author(s): Cheng Zhang, Tingting Liu, Liang Li, Shaolong Wu, Chinhua Wang, Xiaofeng Li, Soochow Univ. (China)
In person: 11 October 2021 • 15:25 - 15:50 China Standard Time
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Ultra-broadband and perfect optical absorption is usually realized by metallic nanostructures, which however have stringent requirements on fabrication. Here, we theoretically deduce the critical optical coupling conditions in a simple planar dual-layer system. We numerically predict and experimentally observe an ultra-broadband, strong, polarization-insensitive, and wide-angle absorption across the longwave near-infrared (LW-NIR, 1.1 – 2.5 μm) band from the planar dual-layer system. The application of the dual-layer system in hot-carrier photodetection is further explored. Results show that the responsivity and detectivity of the planar device can even be an order of magnitude higher than those based on the conventional metallic nanostructures. Such a simple planar system shows great potentials in large-area and lithography-free thermo-photovoltaics, photodetections, thermal emitters, etc.
11904-23
Author(s): Haibin Ni, Nanjing Univ. of Information Science & Technology (China)
In person: 11 October 2021 • 15:50 - 16:05 China Standard Time
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A structure based on coaxial cavity is proposed for high-definition broad-angle coloring in reflection and transmission and polarization-controlled optical switch devices. The developed method employs color engineering based on the localized plasmon resonances in nanocavities, therefore, providing a broad angular response and viewing angles of up to 40°. The proposed approach allows achieving large-area color patterns with local coloring controlled by post-processing, important for display technology. In addition, the nano cylinders in the center of the coaxial cavity can be transformed into tilted nanorods by tilted evaporation, which has high sensitivity to polarization. In the case of S wave, tilted coaxial cavity arrays are sensitive to incident angle.
11904-24
Author(s): Yi Xu, Guangdong Univ. of Technology (China)
In person: 11 October 2021 • 16:05 - 16:20 China Standard Time
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Manipulating light-matter interaction is of vital importance for generating, processing and recording optical information. Pursuing new physical dimensions for engineering light-matter interaction is valuable from fundamental science and application points of view. In general, the ways to manipulate light-matter interaction not only rely on the properties of light but also rely on the properties of matter. Amplitude, frequency, polarization and duration of light are conventional physical dimensions involved in such interaction. In this talk, we study interesting interaction between the angular momentum of light and disorder plasmonic structures, which enables a recorded high dimension for light-matter interaction and promising applications.
Break
Tea/Coffee Break 16:20 - 16:40
Session 6: Optoelectronics and Applications
In person: 11 October 2021 • 16:40 - 18:00 China Standard Time
Session Chair: Zheyu Fang, Peking Univ. (China)
11904-25
Author(s): Ciyuan Qiu, Shanghai Jiao Tong Univ. (China)
In person: 11 October 2021 • 16:40 - 17:05 China Standard Time
11904-26
Author(s): Bin Ai, Chongqing Univ. (China)
In person: 11 October 2021 • 17:05 - 17:30 China Standard Time
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The combination of colloidal lithography and glancing angle deposition facilitates a new powerful fabrication technique – shadow sphere lithography (SSL), which can greatly expand the variety and complexity of nanostructures fabricated using simple evaporation and colloidal monolayer templates. Their applications have been widely investigated in plasmonics and associated fields. Here, we revealed the general principle of SSL , followed by different strategies of utilizing SSL to design various nanostructures by changing the nanosphere monolayer masks, deposition configurations, different ways to combine deposition and etching, etc. Typical nanostructures fabricated by SSL, including nanorods on nanospheres, patchy nanospheres, nanotriangles, nanoring, etc., and their application will be introduced. It is expected that the SSL will inspire more ingenious designs of nanostructures for advanced and smart applications.
11904-27
Author(s): Ting Kong, Shaanxi Normal Univ. (China)
In person: 11 October 2021 • 17:30 - 17:45 China Standard Time
11904-28
Author(s): Ying-Wei Lu, Bin Li, Han-Han Wu, Liang Ren, Hefei Univ. of Technology (China)
On demand | Presented Live 11 October 2021
11904-29
Author(s): Kshetrimayum P. Devi, Pranab Goswami, Harsh Chaturvedi, Indian Institute of Technology Guwahati (India)
On demand
Conference Chair
Zheyu Fang
Peking Univ. (China), Rice Univ. (United States)
Conference Chair
RIKEN (Japan)
Program Committee
Tel Aviv Univ. (Israel)
Program Committee
Hong Kong Univ. of Science and Technology (Hong Kong, China)
Program Committee
Zhejiang Univ. (China)
Program Committee
ICFO - Institut de Ciències Fotòniques (Spain)
Program Committee
Min Gu
Univ. of Shanghai for Science and Technology (China)
Program Committee
Zhejiang Univ. (China)
Program Committee
National Univ. of Singapore (Singapore)
Program Committee
Osaka Univ. (Japan)
Program Committee
Institute of Physics, Chinese Academy of Sciences (China)
Program Committee
Ai Qun Liu
Nanyang Technological Univ. (Singapore)
Program Committee
Rice Univ. (United States)
Program Committee
Ruwen Peng
Nanjing Univ. (China)
Program Committee
Westlake Univ. (China)
Program Committee
Hokkaido Univ. (Japan)
Program Committee
The Hong Kong Polytechnic Univ. (Hong Kong, China)
Program Committee
Jianfang Wang
The Chinese Univ. of Hong Kong (Hong Kong, China)
Program Committee
Hong Wei
Institute of Physics, Chinese Academy of Sciences (China)
Program Committee
Wuhan Univ. (China)
Program Committee
The Chinese Univ. of Hong Kong (Hong Kong, China)
Program Committee
Lei Zhou
Fudan Univ. (China)
Program Committee
Shining Zhu
Nanjing Univ. (China)
Program Committee
Peking Univ. (China)
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