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Conference 11906

Infrared, Millimeter-Wave, and Terahertz Technologies VIII

In person: 10 - 11 October 2021
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  • Opening Ceremony and Plenary Session I
  • 1: Novel THz Generation and Detection
  • Plenary Session II
  • 2: Devices
  • 3: Spectroscopy and Imaging
  • 4: Applications
  • Poster Session
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: Novel THz Generation and Detection
In person: 10 October 2021 • 13:30 - 15:00 China Standard Time
Session Chair: Dayong Wang, Beijing Univ. of Technology (China)
11906-1
Author(s): Weiwei Liu, Nankai Univ. (China)
In person: 10 October 2021 • 13:30 - 14:00 China Standard Time
11906-2
Author(s): Dongwen Zhang, National Univ. of Defense Technology (China)
In person: 10 October 2021 • 14:00 - 14:30 China Standard Time
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We report enhanced non-perturbative high-harmonic and terahertz emission from a LiNbO3 metasurface. The harmonic and terahertz intensity are enhanced by more than one order of magnitude compared to unpatterned samples.
11906-3
CANCELED: Terahertz generation in bulk quartz
In person: 10 October 2021 • 14:30 - 14:45 China Standard Time
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We presents the experimental results of terahertz emission induced and coherently controlled by two-color femtosecond laser in bulk quartz. The variation of radiation amplitude under different azimuth angles and relative phases of two-color fields indicates that the terahertz radiation produced in quartz consists of the mixture of the second-order and the third-order nonlinear processes.At a specific azimuth angle, although the terahertz radiation generated by four-wave mixing of two-color field is one order of magnitude smaller than the terahertz radiation generated by optical rectification, the amplitude, polarity and polarization states of the terahertz wave can be coherently controlled.
11906-4
Author(s): Hongsong Qiu, Biaobing Jin, Nanjing Univ. (China)
In person: 10 October 2021 • 14:45 - 15:00 China Standard Time
11906-5
Author(s): Masato Ota, Koichi Kan, Osaka Univ. (Japan); Soichiro Komada, Mie Univ. (Japan); Yasunobu Arikawa, Verdad C. Agulto, Valynn K. Mag-Usara, Yoichi Sakawa, Osaka Univ. (Japan); Tatsunosuke Matsui, Mie Univ. (Japan); Makoto Nakajima, Osaka Univ. (Japan)
On demand
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Electro-optic (EO) sampling is a powerful non-destructive technique for measuring terahertz (THz) electric field with high temporal resolution. EO sampling is a popular method for monitoring the electron beams in accelerators because the measurement of the electric field pulse width directly corresponds to the width of the electron beam. Previous researches mainly focused on measuring the temporal profile. In this work, we also measure the spatial (radial) profile that is perpendicular to the propagation (longitudinal/temporal direction). The measurement of the electric field profiles in both time and space paves the way to access the spatio-temporal electron beam profile, which makes this method promising for a high-order harmonic generation-seeded free-electron laser (FEL).
11906-6
Author(s): Hannah Bardolaza, Alexander De Los Reyes, Neil Irvin Cabello, National Institute of Physics, Univ. of the Philippines Diliman (Philippines); John Paul Ferrolino, Univ. of the Philippines Diliman (Philippines); Ivan Cedrick Verona, Armando Somintac, Arnel Salvador, National Institute of Physics, Univ. of the Philippines Diliman (Philippines); Elmer Estacio, University of the Philippines (Philippines)
On demand
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Terahertz (THz) photoconductive antennas (PCA’s) from SI-GaAs substrates having one-dimensional (1D) and two-dimensional (2D) micron-size metal line arrays (MLA's) were fabricated. Photolithography and electron beam deposition of Ni/Au were used to fabricate spiral PCA’s and 1D/2D MLA's on the transmission side of the PCA. Compared to a reference bare PCA, the THz time-domain signal enhanced ~6x for 1DMLA and ~11x for 2DMLA, with their corresponding bandwidths broadened. The origin of the enhancement is being investigated but is currently attributed to spoof surface plasmon phenomena. Integrating MLA’s with PCA’s demonstrates a more cost-effective alternative to nanostructure fabrication within the PCA gap.
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 - 17:00
Session 2: Devices
In person: 10 October 2021 • 16:30 - 17:45 China Standard Time
Session Chair: Dongwen Zhang, Hebei Univ. of Science and Technology (China)
11906-12
CANCELED: Manipulation on terahertz slow light at spoof surface plasmon-induced transparency windows (Invited Paper)
In person: 10 October 2021 • 16:30 - 17:00 China Standard Time
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Terahertz slow light beyond 40 ps is achievable by tuning the spoof localized surface plasmon (SLSP)-induced transparency window (PIT).The dipolar mode at high frequency causes a red-shift resulting to a destructive interference. By tuning the central angle θ of the arc, slow light summits are induced at certain frequency of transparency windows. Moreover, by tuning the diameter of the ring structure of textured close cavity, the coupling coefficient and damping ratio of SLSP is are manipulated artificially.Thus, we demonstrate polarization-insensitive terahertz slow light at spoof surface plasmon-induced transparency windows of metasurface in C 2 lattice symmetry, and compare its performance with the counterpart in C 4 lattice symmetry for the first time. The coupling coefficient and damping ratio at transparency window in C 4 symmetric lattice is 5 times higher than in C 2 symmetric lattice.
11906-13
Author(s): Ye Wang, Xiuhua Fu, Changchun Univ. of Science and Technology (China); Lijun Wang, YongYi Chen, Changchun Institute of Optics, Fine Mechanics and Physics (China); Zhongyao Zhu, BRIMET (China); Li Qin, Jinlong Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
On demand | Presented Live 10 October 2021
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A femtosecond laser is used as terahertz excitation source, the excess pump light in the system may cause radiation damage to the measured object. To eliminate the impact of residual pump light we designed the spectral filter of reflection of 0.8 μm and 1.560 μm and terahertz band transmission by using Nb2O5/SiO2. The influence of annealing process on the growth structure was analyzed according to the AFM test results of Nb2O5 monolayer films under different conditions; Based on the KIM, the optical constant dispersion of Nb2O5 prepared under different conditions was fitted. The influence of temperature on the refractive index and absorption of Nb2O5 were analyzed. The deposition temperature was optimized to reduce absorption of 0.8μm and 1.56μm. The average reflectivity was 99.9% both 0.8μm and 1.56μm. The transmittance of 2THz was 68%, which was almost consistent with the theoretical values, and could meet the requirements for the terahertz nondestructive testing system’s application
11906-14
Author(s): Chishen Huang, Chao Li, Yaohua Du, Academy of Military Science (China)
In person: 10 October 2021 • 17:15 - 17:30 China Standard Time
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In this work, a theoretical model was built in COMSOL to calculate the resonant frequency shift of a metamaterial device at different sample densities. With this model, a coupled resonator (RS) design was developed and the structure and material parameters of it was optimized to maximize the resonant frequency shift. For a resonator at 2 THz, theoretical prediction of the sensitivity is 69 GHz/RIU. A biosensor was then fabricated with RSs being the sensing elements. The resonant frequency shift of it was measured with a THz TDS system and was studied as a function of the sample (fungi) number density.
11906-15
Author(s): Jinying Fan, Jianming Zhou, Xudong Wang, Jiejun Zhang, Jinan Univ. (China); Jianpeng Yao, Univ. of Ottowa (Canada)
On demand | Presented Live 10 October 2021
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Microwave signal with high frequency and low phase noise is generated based on a parity-time (PT) symmetric optoelectronic oscillator (OEO). The PT-symmetric OEO based on normal and reversed traveling-wave modulation is formed by normal and reversed modulation in a travelling-wave intensity modulator (IM) using the radio-fiber (RF) input and termination ports. Gain and loss balance can be realized to achieve PT symmetry thanks to the different modulation efficiencies for microwave signals applied via different RF ports. The operation of the proposed OEO has been experimentally verified. A microwave signal is generated at 10 GHz with a phase noise of -110.7 dBc/Hz at an offset frequency of 10 kHz and a sideband suppression ratio of 46.46 dB. The approach has potential applications in high-quality microwave signal generation and simplify the structure of PT-symmetric OEO system.
11906-16
Author(s): Nikolay V. Petrov, Maksim S. Kulya, Yaroslav V. Grachev, ITMO Univ. (Russian Federation); Andrei Gorodetsky, Univ. of Birmingham (United Kingdom), ITMO Univ. (Russian Federation); Bogdan V. Sokolenko, Aleksey V. Chernykh, ITMO Univ. (Russian Federation)
On demand
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We present an approach for broadband terahertz vortex beams shaping by designs of the static modulator based on super achromatic quartz waveplates. Two modulator designs were considered and numerically investigated to provide the possibility of obtaining both scalars (having one polarization component) and vector (having three nonzero field components Ex, Ey, Ez) broadband vortex beams. As a result of the numerical study, it was found that the achromatic properties of the modulator components provide the formation of vortex THz radiation with a single topological charge in the range of 0.4-1.4 THz as well as 2.0-2.6 THz and radiation with a single topological charge with opposite sign in the range of 2.6-3.0 THz. The distributions of the modulus and phase of the spectral density, as well as spatio-temporal and spatio-spectral distributions of the vortex beams, were investigated by terahertz pulse time-domain holography.
Session 3: Spectroscopy and Imaging
In person: 11 October 2021 • 08:20 - 10:05 China Standard Time
Session Chair: Yiwen Sun, Shenzhen Univ. (China)
11906-7
Author(s): Dayong Wang, Lu Rong, Jie Zhao, Beijing Univ. of Technology (China), Beijing Engineering Research Ctr. of Precision Measurement Technology and Instruments (China); Yunxin Wang, School of Physics and Optoelectronics (China), Beijing Engineering Research Ctr. of Precision Measurement Technology and Instruments (China); Cun-Lin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 08:20 - 08:50 China Standard Time
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Here we introduce two lensless CW THz phase imaging approaches, THz digital holography (TDH) and THz ptychography. TDH reconstructs the object wavefront by recording the intensity of interference pattern known as “hologram” and thereafter numerical diffraction propagation. THz ptychography records redundant diffraction patterns in the Fresnel region at a set of overlapping probe positions of the object. By using the ePIE algorithm, both the complex-valued object transmittance function and the probe function are retrieved simultaneously. In this presentation, different setup geometries and application scenarios of TDH, e.g., in-line TDH, multi-layer TDH, off-axis Fresnel TDH, reflective TDH, common-path TDH, and total internal reflective TDH would be introduced. On the terms of THz ptychography, the dual-plane PIE (DP-PIE), extrapolation ePIE (EE-PIE), cross-correlation-based PIE (cc-PIE) algorithms are developed to accelerate the convergence and computational speed, to enhance the late
11906-8
Author(s): Zhenwei Zhang, Capital Normal Univ. (China), Beijing Institute of Technology (China), Beijing Engineering Research Ctr. of Terahertz and Infared Wave (China); Yuejin Zhao, Beijing Institute of Technology (China); Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 08:50 - 09:20 China Standard Time
11906-9
Author(s): Zhengxin Wang, Institute of Modern Optics, Nankai Univ. (China); Gang Liu, Xinyu Li, Institute of Modern Optics (China); Lanjun Guo, Cheng Gong, Weiwei Liu, Institute of Modern Optics, Nankai Univ. (China)
On demand | Presented Live 11 October 2021
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Here we present a novel reflective confocal method for super-resolution terahertz (THz) imaging. The traditional continuous-wave THz confocal method cannot break through the diffraction limit owing to the Abbe limit. So, it’s difficult to achieve super-resolution images, especially in low frequency THz wavebands. Besides, the traditional terahertz lens system has a large loss, so it cannot achieve long-distance transmission and imaging. In this paper, low-cost and low-loss terahertz waveguides are printed to replace conventional lenses. Through the reasonable design of the waveguide, we can breaks through the diffraction limit and achieve sub-wavelength focusing, so as to achieve super-resolution terahertz imaging.
11906-10
Author(s): Zhaohang Peng, Bowen Fan, Kangmin Zhou, Shengcai Shi, Purple Mountain Observatory (China)
On demand | Presented Live 11 October 2021
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Phased array feeds (PAF) are playing an increasingly important role in low-frequency radio astronomy, but less explored at THz wavelengths. We present the design of a 0.35-THz planar array antenna, which consists of an array of twin-slot antennas, a coplanar waveguide (CPW) feed network and airbridges. The planar array antenna is based on a silicon substrate without any lens as well as anti-reflection coating. The airbridges are used to improve the performance of the CPW T-junctions and the transmission efficiency. Simulation results show that the substrate thickness can change the power distribution on both sides of the substrate. With an appropriate substrate thickness and some airbridges, the total gain of a 16-element array can reach 15.3 dB and the main-beam efficiency is about 54%. This kind of planar array antenna can be easily integrated with a THz detector such as hot electron bolometer (HEB) and kinetic inductance detector (KID), based on photolithographic fabrication.
11906-11
Author(s): Tana Gegen, Kai Zhong, Fangjie Li, Hongzhan Qiao, Xianzhong Zhang, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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The feasibility and performance of generating terahertz waves in the 4H-SiC crystal via difference frequency generation is theoretically analyzed, including the phase matching (PM) condition, effective nonlinear coefficient, walk-off angle, PM tolerance, and the power conversion efficiency versus crystal length. Benefiting from the ultrahigh damage threshold and low absorption coefficient, 4H-SiC can be a superior nonlinear material for terahertz generation. Unprecedented high power terahertz radiation can be generated in centimeter-long 4H-SiC crystals under intense pumping especially at high frequencies around 10 THz, despite of a relative low nonlinearity.
Break
Tea/Coffee Break 10:05 - 10:30
Session 4: Applications
In person: 11 October 2021 • 10:30 - 12:00 China Standard Time
Session Chair: Cunlin Zhang, Capital Normal Univ. (China)
11906-17
Author(s): Yiwen Sun, Shenzhen Univ. (China); Jialiang Huang, Xudong Liu, Shenzhen University (China)
On demand | Presented Live 11 October 2021
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Terahertz spectroscopy is able to provide the new technological advances such as label-free and non-ionizing in biomolecule detection, and hereby we present a promising approach for the label-free protein sensing in liquid environment. In this work, we designed a graphenebased sensor which can be applied with a bias voltage to form an electric field to increase the accumulated amount of protein molecules in the solution. The sensor demonstrates a quick and sensitive response to HER2 proteins and gave a linearly response to the concentrations of HER2 from 63 ng/ml to 4.0 ug/ml. A discussion of the potential application for the next generation protein chips in terahertz frequency is presented as well.
11906-18
Author(s): Xu Wu, Can Sun, Yan Peng, Yiming Zhu, Songlin Zhuang, Univ. of Shanghai for Science and Technology (China)
In person: 11 October 2021 • 11:00 - 11:15 China Standard Time
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The pharmaceutical effect for the anticoagulant rivaroxaban closely associated with its molecular conformation. Here we investigate the molecular conformation of rivaroxaban by THz-TDS and FTIR (0.5-16 THz). The results show that rivaroxaban has a unique absorption spectrum in the THz band. A solid-state density functional theory (DFT) calculation was implemented to better understand the low-frequency vibrational property of rivaroxaban. The calculated results agree well with the experimental observations, and suggests that the each THz resonance peak has its own specific vibrational mode, which corresponds to a specific structure and interaction. In addition, three strongest absorption peaks in the range from 8 to 12 THz were linearly increased as the concentration increased. Based on these concentration-dependent peaks, we can recognize rivaroxaban at molecule level with multi-quantitative indicators. These results may be helpful for the clinical monitoring of rivaroxaban.
11906-19
Author(s): Bowen Fan, ZhaoHang Peng, Wei Miao, Shengcai Shi, Purple Mountain Observatory (China)
On demand | Presented Live 11 October 2021
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Conventional coherent and non-coherent techniques such as quasi-optical vector network analyze (VNA) and Fourier transform spectroscopy (FTS) can be employed to measure the exhaustive properties of dielectrics in the terahertz band. However, the VNA can only cover a narrow frequency range, and the FTS takes a relatively long period of time for measurement. By contrast, the terahertz time domain spectroscopy (TDS) allows the measurement of material properties such as dielectric constant and loss tangent in a wide frequency range and in a short period of time. Using a terahertz TDS, we characterize the complex properties of some materials commonly used in terahertz superconducting receivers, including high density polyethylene (HDPE), single crystal magnesium oxide (MgO), single crystal quartz, single crystal sapphire, single crystal silicon (S.C. silicon), high resistance silicon (H.R. silicon), and ultra-high molecular weight polyethylene (UHMWPE).
11906-20
Author(s): Pingjie Huang, Yuqi Cao, Zhejiang Univ. (China); Xusheng Kang, Zhejiang Univ. City College (China); Dibo Hou, Guangxin Zhang, Zhejiang Univ. (China)
In person: 11 October 2021 • 11:30 - 11:45 China Standard Time
11906-21
Author(s): Jufeng Zhao, Junjie Zhu, Guangmang Cui, Hangzhou Dianzi Univ. (China)
In person: 11 October 2021 • 11:45 - 12:00 China Standard Time
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Infrared and visible image fusion could inherit that particular information of the two sources. People need to particularly focus on local contrast, which is one of the most important factors in two-band image fusion. We propose an infrared and visible image fusion method through local contrast maximization and local information optimization. Firstly, we design a local contrast measurement method based on local difference and local entropy. Secondly, the local contrast measurement is combined into a fusion optimization algorithm using Bayes optimal strategy, which considers varied local windows and relative weights of the two source images. Thirdly, the optimal weights for different pixels and regions are obtained for two source images, and effective fusion is achieved. Compared with several classical and state-of-art methods, both subjective and objective assessments indicate the good performance of the proposed method.
11906-22
Author(s): Anatoly Kvitsinskiy, ITMO Univ. (Russian Federation); Maxim Rybin, A. M. Prokhorov General Physics Institute (Russian Federation); Anton Zaitsev, Kirill Bogdanov, Dmitry Zykov, ITMO Univ. (Russian Federation); Elena Obraztsova, A. M. Prokhorov General Physics Institute (Russian Federation), Moscow Institute of Physics and Technology (Russian Federation)
On demand
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Efficient devices for control properties of electromagnetic waves are essential for the development of terahertz (THz) technologies. But despite the great progress achieved in a study of graphene, the influence of the number of graphene layers on its properties in the THz frequency range has not yet been sufficiently studied. In this work, we experimentally studied properties of multilayer graphene (MLG) films in the frequency range 0.2–0.8 THz, at a room temperature, and a relative humidity of 40%. Using our custom-made THz time-domain spectroscopic polarimetry system, we obtained spectra of the complex relative permittivity and the electrical conductance of the chemical vapor deposition graphene with ~14, ~40, and ~76 layers of graphene on glass substrates. It is shown that the conductance increases nonlinearly with an increase in the graphene layer number and reaches, for ~76 layers, 0.06 S for the real, and 0.03 S for the imaginary part, respectively.
11906-23
Author(s): Mohamed Ellithey, Hany El-sheikh, Alaaeldin Mahmoud, Ayman M. Mokhtar, Military Technical College (Egypt)
On demand
Break
Lunch Break 12:00 - 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
11906-24
Author(s): Hui Zhao, Jiuquan Satellite Launch Ctr. (China); Fengzhou Dai, Xidian Univ. (China); Xiaofei Lu, Jiuquan Satellite Launch Ctr. (China)
On demand
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Infrared character of aircraft is one important factor to estimate the ability of breaching the defense of enemy, this paper firstly analyzed the method of infrared calibration with collimator and energy factors composing the sky background, propose one method of deleting energy of background within current image; furthermore, the paper points out that the parameters of calibration with collimator can’t be directly applied to computing Infrared character of flying target, and based on that propose the method of deleting energy of background with another background image measured before mission.
11906-25
Author(s): Li Fan, Chen-Hao Gou, Zheng-Mao Wu, Guang-Qiong Xia, Zhu-Yu Ding, Southwest Univ. (China)
On demand | Presented Live 11 October 2021
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Based on a current modulated semiconductor laser (SL) subject to optical injection, tunable and broadband microwave frequency comb (MFC) generation is theoretically investigated. For a SL under only current modulation, a seed MFC with relatively narrow bandwidth can be generated. Then, an optical injection is introduced to improve the quality of seed MFC. Furthermore, the influences of operation parameters on the performance of MFC are also discussed. The numerical results show that after introducing optical injection with injection coefficient k = 1.8×10-4 and detuning frequency Δf = 6.0 GHz, the MFC bandwidth can be further increased by 15.6 GHz and the signal-to-noise ratio can be improved by more than 20 dB.
11906-26
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); Ronggang ZHU, Science and Technology on Electro-optic Control Laboratory, China (China)
On demand | Presented Live 11 October 2021
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A method of continuous zoom multiple configuration, with a micro lens array and core optics is attempt to establish model by novel principle on resonance energy transfer and high accuracy localization, by which the system resolution can be improved with a level of a few nanometers. A comparative study on traditional vs. modern methods can demonstrate that the dialectical relationship and their balance is important, among Merit function, Optimization algorithms and Model parameterization.
11906-27
Author(s): Taiyang Hu, Jinyu Zhang, Xiaolang Shao, Lei He, Mengxuan Xiao, Zelong Xiao, Nanjing Univ. of Science and Technology (China)
On demand | Presented Live 11 October 2021
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In order to effectively reconstruct millimeter-wave images within the framework of block-based Compressed Sensing (CS), the adaptive sampling methods based on visual saliency and block information weight are proposed in this paper. In view of the irrationality of allocating the same amount of encoded data to different image blocks in the traditional block-based CS, both the adaptive sampling method based on visual saliency and local variance weighted adaptive allocation, and the adaptive sampling method based on visual saliency and two-dimensional information entropy weighted adaptive allocation, are put forward and compared with other allocation methods. Some experimental results demonstrate that the proposed method can effectively improve the PSNR value of the reconstructed image. In addition, the reconstructed images with a low sampling rate are also in conformity with human vision.
11906-28
Author(s): Jiahao Zeng, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In summary, by using a TAG lens and a fiber delay network into the PAM system, we developed a multifocus photoacoustic microscope. The TAG lens is used to high -speed focus-shift, and the fiber delay network output three laser beams with different delay time, and the laser pulse of each synchronizes with a vibration state of the lens, which we can obtain three focuses to improve the DoF of PAM system. In the experiments above, a 20 Vp-p sinusoidal signal with frequency of 707 kHz was driven on the TAG lens when TAG lens on. The DoF we measured by a vertically tilted carbon fiber is eatimated to larger than 775 μm. The lateral resolution by imaging a sharp bar edge of an resolution target is 2.8 μm. The large DoF of PAM was also verified by imaging a tungsten wire network and a zebrafish. It is worth noting that the MF-PAM improves the DoF without sacrificing the capability of functional imaging.
11906-29
Author(s): Wei-Tao Lv, Qing Shi, Jing Li, Zheng Wang, Shengcai Shi, Purple Mountain Observatory (China)
On demand | Presented Live 11 October 2021
11906-30
Author(s): Wanlin Liang, Mengyuan Wang, Suqi Zhang, Qingli Zhou, Jian Zuo, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Resonant metamaterials are widely used in the field of biosensors because they are sensitive to the changes of surface dielectric environment. In this study, we demonstrated a highly sensitive detection method of 4-Mercaptohydrocinnamic acid using terahertz metamaterials fabricated on silicon substrate with metal arrays of the three bars structure. We measured the transmission spectra of the metamaterial to detect the 4-Mercaptohydrocinnamic acid at three different densities by the terahertz time-domain spectroscopy system. With the density of 4-Mercaptohydrocinnamic acid increasing, resonant dips exhibit the red-shift phenomena and transmission at the resonance frequency simultaneously reduce. The movement of resonance dips and the change of transmission show that the three bars resonators are sensitive to the density of analyte.
11906-31
Author(s): Jiayu Lyu, Labao Zhang, Yanqiu Guan, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Xiao Zhang, Research Institute of Superconductor Electronics (China)
On demand | Presented Live 11 October 2021
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Superconducting nanowire single photon detectors (SNSPDs) as a new type of single photon detector have attracted extensive attention owing to its excellent performance. However, the state-of-the-art SNSPDs are usually single pixel, which have limited coupling efficiency, long dead time, and cannot distinguish the number of photons. Here superconducting-nanowire array is fabricated for developing SNSPD array, which can be further used in quantum imaging, time-resolved imaging, and lidar applications. The nanofabrication was based on an improved 2D process instead of previous 3D process. This process features in low requirements of process equipment and high product yield rate. In this way, we successfully fabricated the NbN superconducting naowire array with 128×128 pixels. Using the row-column multiplexing architecture, we have characterized the array’s yield, resistance and IV.
11906-32
Author(s): Jiuzhou Han, Pandeng Wang, Zhongxin Zhao, Xiaolei Wu, Jingsuo He, Bo Su, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, a 3D transmission model combining LOS path, primary reflection path and secondary reflection path was established by ray tracing method for indoor laboratory scenes with high demand for communication rate. The carrier frequency range is 220-330GHz. Through the results of power delay profile (PDP) and power angle profile (PAP) at the receiver, the correlation characteristics of important channel parameters such as Rician K-factor and root mean square (RMS) delay spread with different frequency points and different paths are analyzed. The results show that all the channel parameters are strongly correlated with frequency and transmission distance. These theoretical results lay a foundation for the subsequent communication experiments in real experimental condition.
11906-33
Author(s): Qinghao Meng, Jing Ding, Qingjun Li, Bo Su, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Terahertz (THz) wave are electromagnetic waves with a frequency range of 0.1–10 THz and a wavelength range of 0.03–3 mm1-2. Because many weak interactions between molecules, rotational and vibrational jumps of dipoles, and low-frequency vibrational absorption of lattices in crystals fall within the THz band, Therefore, THz spectroscopy is widely used in the analysis and research of chemical molecules and other substances. In this study, a THz microfluidics chip with automatic sample entry and exit function is designed and implemented for the transmission THz-TDS system. The chip was used to measure distilled water, NH4Cl, (NH4)2SO4, (NH4)2CO3 and CH3COONH4 solutions, respectively. Transmission spectra were obtained in the 0.1–0.6 THz frequency range. It was discovered that the four kinds of anions in the solution all promoted the formation of hydrogen bonds between water molecules.
11906-34
Author(s): Siyu Shao, Haiyun Huang, Guoyang Wang, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In this paper, a high sealing microfluidic chip is used, which has the advantages of simple manufacturing process, stable quality, and saving the use of COC materials. The depth of liquid pool in the detection area is controlled by controlling the distance between the embedded COC and the upper surface of the substrate. Finally, the chip is used to test the soluble starch under the condition of magnetic field, and the terahertz spectral characteristics were obtained, and then the terahertz spectral characteristics of soluble starch under the action of electric field were obtained. It provides technical support for the development and application of soluble starch, and has a strong reference significance for the research of other biological macromolecules.
11906-35
Author(s): Feiyan Li, Labao Zhang, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Feifei Jin, Research Institute of Superconductor Electronics (China); Biao Zhang, Hang Han, Yuqing Guo, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Yue Dai, Research Institute of Superconductor Electronics (China); Xiaoqing Jia, Lin Kang, Peiheng Wu, Research Institute of Superconductor Electronics, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
11906-36
Author(s): Yue Dai, Hui Li, Yue Fei, Labao Zhang, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Qi Chen, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Feiyan Li, Xiaoqing Jia, Lin Kang, Peiheng Wu, Research Institute of Superconductor Electronics, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
11906-37
Author(s): Pandeng Wang, Jiuzhou Han, Qingyuan Yao, Xiaolei Wu, Jingsuo He, Bo Su, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, according to the position of the receiver and the surrounding scenes, the possible path from the transmitter to the receiver is traced back through geometric optics. The influence of diffraction on the transmission channel of 300GHz indoor communication system is evaluated. Ray tracing technology is combined with knife edge diffraction (KED) and double knife edge (DKE) to simulate the diffraction of wedge-shaped object and human body respectively. The results show that when the wedge-shaped object diffracts, the diffraction coefficient decreases with the increase of the diffraction angle. Diffraction in the wedge area can be ignored in most areas of the room's line of sight, but diffraction power is dominant in the incident boundary and reflection boundary area. Due to the shadow effect caused by human movement, the path attenuation increases significantly. The results provide a research basis for the development of indoor terahertz communication.
11906-38
Author(s): Qingjun Li, Yan Shen, Qinghao Meng, Bo Su, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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The five potassium salt solutions in a constant electric field at different times were studied, which provided a basis for further strengthening the application of THz technology in biochemistry. What’s more, the electrolyte solution contains a large number of anions and cations, which will move under the action of electric field. And it provides technical support for the study of the dynamic characteristics of electrolyte solution by terahertz technology.
11906-39
Author(s): Yan Shen, Qingjun Li, Jing Ding, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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The terahertz transmission characteristics of four kinds of sodium salts under the action of electric field were tested by using microfluidic chips with strong sealing performance. In order to avoid the influence of ionic impurities in aqueous solution, deionized water was used to prepare the solution. NaCl, CH3COONa, NaHCO3 and Na2CO3 electrolyte solutions with concentration of 0.9 mol/l are selected. The four solutions were injected into the microfluidic chip in turn, and then put into the external electric field device. The electric field treatment time is 0 min, 5 min, 10 min, 15 min and 20 min respectively. The transmission intensity is measured by terahertz time domain spectroscopy system every five minutes, and the corresponding spectrum can be obtained. The results show that with the increase of electric field time, the THz transmission intensity of the four sodium salt solutions increases.
11906-40
Author(s): Jing Ding, Qinghao Meng, Yan Shen, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-41
Author(s): Haiyun Huang, Siyu Shao, Guoyang Wang, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In this paper, organic glass and coc5013 material with high transmittance to terahertz wave were used to prepare microfluidic chip. Then the terahertz transmission of guar gum colloid was studied under constant electric and magnetic fields. It was found that different exposure time of guar gum in constant electric field and magnetic field had different transmission to terahertz wave, which indicated that constant electric field and magnetic field changed the physical and chemical properties of guar gum, and then affected the transmission of guar gum to terahertz wave. This experiment can be used to identify guar gum content in food additives, and also provide a theoretical method for the detection of additive content in food.
11906-42
Author(s): Qi Chen, Rui Ge, Labao Zhang, Feiyan Li, Biao Zhang, Feifei Jin, Hang Han, Yue Dai, Guanglong He, Yue Fei, Xiaohan Wang, Hao Wang, Xiaoqing Jia, Qingyuan Zhao, Xuecou Tu, Lin Kang, Jian Chen, Peiheng Wu, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
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Superconducting nanowire single photon detectors (SNSPDs) have shown great potential in mid-IR single photon detection relied on the low energy gap (~meV) of superconductor materials. Recently, the amorphous superconductor MoSi has shown promise as a high-performing material in near-IR SNSPDs. Considering the low superconductor energy gap of MoSi, it is a competitive candidate for mid-IR SNSPDs. Herein, we report a mid-IR SNSPD based on a 30 nm wide superconducting MoSi nanowire with high internal detection efficiency. Furthermore, almost saturated internal detection efficiencies in the range of 1.55-5.07 µm wavelength are exhibited at a noise equivalent power on the order of 10-18 W/ Hz1/2.
11906-43
Author(s): Li Lu, Zhen Wang, Yuan Jiang, Yi Zheng, Air Force Early Warning Academy (China)
On demand | Presented Live 11 October 2021
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In order to realize multi-function, the radar has wide instantaneous bandwidth and working bandwidth. Unfortunately, the traditional phased array radar antenna by microwave phase shifter or DDS in the way of phasing. There are two limitations after increasing the instantaneous bandwidth: "beam squinting" and "aperture traverse delay", which cause the beam divergence and the beam broadening. In this paper, the integrated optical beamforming network technologies are discussed analyzed, which provide certain theoretical support for the research of the future multi-band broadband reconfigurable radar and even the engineering of microwave photonic radar.
11906-44
Author(s): Hao Wang, Xiaohan Wang, Guanglong He, Yue Fei, Jiayu Lyu, Qi Chen, Jingrou Tan, Haochen Li, Hui Li, Labao Zhang, Nanjing Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-45
Author(s): Xiangyu Wang, Xue Yang, Wei Fang, Gangbo Hu, Ning Tao, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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To better understand the heat diffusion in the multi-layer structure, this paper is focused on the influence of the middle layer thickness and the defect size in a metal-air-metal structure by using finite element simulation and light-excited thermograph experiments. The research results can be utilized as a reference when locating the rivet holes and evaluating defects at the bottom layer in a three-layer structure.
11906-46
Author(s): Zijie Dai, Nankai Univ. (China); Manukumara Manjappa, Ranjan Singh, Nanyang Technological Univ. (Singapore); Yunkun Yang, Faxian Xiu, Fudan Univ. (China); Weiwei Liu, Nankai Univ. (China)
On demand | Presented Live 11 October 2021
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Recently, Dirac materials have emerged as a potential candidate for high-performance optoelectronic applications due to its zero bandgap and symmetry-protected massless Dirac fermions. In this paper, utilizing the time-resolved terahertz spectroscopy, we experimentally demonstrated an optical controlled terahertz modulator based on the 3D Dirac semimetal Cd3As2 thin film (~100nm, λ/3000). The measurements reveal Cd3As2 thin film has high terahertz mobility of electrons (7200cm2/Vs), ultrafast charge carrier relaxation (15.5ps) and long momentum scattering time (157fs). Additionally, the conductivity of the film increases from 7×104S/m to 2.8×105S/m when the applied pump fluences increase from 0 to 1270μJ/cm2. These superior photo-tunable properties allow Cd3As2 thin film to be an ideal photoactive THz modulator, which shows a low optical threshold (~2.54μJ/cm2) and ultrafast (<15.5ps) broadband (0.2-1.5THz) modulation of THz waves with modulation depth up to 63% (63.5μJ/cm2).
11906-47
Author(s): Gangbo Hu, Zhuoqiao Wu, Xue Yang, Ning Tao, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Emissivity is one of the important parameters to reflect the thermal characteristics of the surface of an object. In this paper, a novel non-contact method is proposed to measure the coating’s emissivity using the dual-temperature method, and the error of the measured infrared emissivity with different base board materials was analyzed.
11906-48
Author(s): Hengshun Luan, Ning Tao, Capital Normal Univ. (China); Wei Liu, National Museum of China (China); Xue Yang, Capital Normal Univ. (China); Jianli Chen, Peking Univ. (China); Jiangang Sun, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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An active infrared thermal imaging technique is developed to measure the thickness of the rusted bronze layer. Pulse flash lamp was used to excite the surface of the specimen, and infrared camera was used to record the temperature decay of the specimen surface before and after flash. This paper presents a pulse thermal imaging multi-layer analysis method (PTI-MLA) which consists of a pulsed thermal imaging (PTI) system to acquire experimental data and a multilayer analysis (MLA) data-processing algorithm to derive parameters of the corroded bronze. This paper studies a bronze pot fragment from the China’s Spring and Autumn period excavated in Sujialong site, Hubei province. The corrosion thickness map of the fragment is calculated and analyzed by PTI-MLA method. Comparing the measured values with the CT scanning results, the error is less than 10%. The final result indicates that the PTI-MLA method can be used to measure the thickness of rust layer on the surface of bronze ware.
11906-49
Author(s): Li Wang, Ning Tao, Zhuoqiao Wu, Jiangang Sun, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Pulse phase thermography (PPT), principal component thermography (PCT) method and Thermal signal reconstruction (TSR) analysis including Logarithmic First-Derivative (LFD) and Logarithmic Second-Derivative (LSD) method have been widely used to improve detection sensitivity and quantitative measurement accuracy in infrared thermal imaging. In this paper, the difference of pulsed thermography results of aluminum specimens with flat bottom holes (FBHs) under PPT method, PCT method and LFD and LSD method was compared. With the result of the above methods, the multi-image average method is proposed to further improve the signal-to-noise ratio at the defect of images. Finally, the difference between the original result and the improved result are compared.
11906-50
Author(s): Wei Fang, Xue Yang, Xangyu Wang, Gangbo Hu, Ning Tao, Cunlin Zhang, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Pulsed thermography for defect assessment is now widely used to detect the size and depth of defects. For example, it can be applied to detect polymeric materials for aircraft structures, ceramic composites for high temperature engine applications, and so on. The two most commonly used modes of the thermal excitation for thermal imaging are modulated and pulsed thermography. For both modulated and pulsed thermography, the relation between the thermograph and the width-to-depth ratio of the defect is not well discovered. This paper presents a new method for defect width-to-depth ratio measurement using sequential pulsed laser technology.
11906-51
Author(s): Siliang Liu, Xiaolei Wang, Xiaoxue Hu, Wenqing Lin, Nankai Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-52
Author(s): Sen Wang, Ning Tao, Capital Normal Univ. (China); Jing He, Chao Ge, Shixing Wang, Chinese Academy of Agricultural Mechanization Sciences (China); Jiangang Sun, Capital Normal Univ. (China)
On demand | Presented Live 11 October 2021
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Thermal barrier coatings (TBCs) have been widely used in hot end components of engines, such as blades and combustors, due to their high temperature corrosion resistance, heat insulation and oxidation resistance. The thermal conductivity, constant pressure heat capacity and coating thickness are important indexes in the design process of TBCs. A reasonable coating thickness is an important criterion for its quality evaluation. In this paper, pulsed thermal imaging multilayer analysis method is used to measure the coating thickness of thermal barrier coating samples. Firstly, a two-layer model is constructed by finite element simulation to obtain the measurement results under ideal conditions, and the method is evaluated. Then, the accuracy of the method is further verified by experiments of five TBC samples with different coating thickness.
11906-53
Author(s): Longcheng Feng, Caihong Zhang, Nanjing Univ. (China)
On demand | Presented Live 11 October 2021
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The real-time terahertz near-field spectroscopic imaging system we built can realize near-field information in the surface wavelength range of the test sample, and has good system resolution. It can perform real-time sample analysis on biological samples to ensure biological sample activity; in addition, the system It has the dual function of collecting image information and spectrum information at the same time, using spectrum information to obtain parameters such as refractive index and absorption coefficient, and analyzing local sample information from image information, which can overcome the shortcomings of ordinary THz-TDS that the local characteristics of the sample cannot be obtained; The system can also test the response information of the metamaterial sample with the polarization to the THz, and it has great application prospects in the functional testing of many metamaterial terahertz devices.
11906-54
Author(s): Qiang Zhang, Yuan Hou, Qi Guo, Xi'an Aerospace Chemical Propulsion Co., Ltd. (China); Zhenwei Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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The thermal insulation layer is a thermal insulation protection material pasted between the inner surface of the engine shell and the propellant grains. The precise control of its thickness ensures the integrity and reliability of the engine structure performance is also the key to the success or failure of missiles and aerospace launches. However, in the absence of precise detection technology, a large redundancy design is forced to sacrifice performance in exchange for high reliability. Aiming at this problem, this paper uses terahertz time-domain spectroscopy technology to develop an in-situ detection device and method that can be used in the insulation process to test the engine insulation layer, obtain the characteristic spectrum of the insulation layer, and accurately give the thickness of the insulation layer. The experimental results show that the relative standard deviation of this method can reach 0.2%, indicating that terahertz can be used to measure the thickness of insulat
11906-55
Author(s): Ji Cao, Capital Normal University (China); Rui Jia, Capital Normal Univ. (China); Jing Xu, Beijing Institute of Technology (China); Zhenwei Zhang, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-56
Author(s): Chunlian Li, Capital Normal University (China); JianChao Li, Institute of surface engineering technology, Chinese Academy of Agricultural Mechanization (China); Qing He, Institute of surface engineering technology (China); Yuping Yang, School of Science, Minzu University of China, Beijing 10081,China (China); Cunlin Zhang, Capital Normal Univ. (China); Zhenwei Zhang, Capital Normal Univ (China)
On demand | Presented Live 11 October 2021
11906-57
Author(s): Shan Zhang, Gaoyin He, Chun Lin, Yanfeng Wei, Honglei Chen, Xiaoning Hu, Ruijun Ding, The Shanghai Institute of Technical Physics (China)
On demand | Presented Live 11 October 2021
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The ps-laser micro-machining technology for substrate-removed HgCdTe IRFPAs is researched in this paper. By analysis the microstructure morphologies under different pulse energy,the ablation threshold is fitted. Based on the analysis of ablation threshold, we optimize the laser parameters and etch grooves on the HgCdTe chip which is substrate removed and thinned to 5µm. The FPAs experiment test results show that thermal effected area was about 10µm away from the grooves, and the laser has no effect on the ROIC under the HgCdTe chip. The results are important to verify the optimal strategy of ps-pulsed laser for robust operation of substrate-removed HgCdTe IRFPAs and for laser micromachining industrial applications.
11906-58
Author(s): Yaroslav V. Grachev, ITMO Univ. (Russian Federation); Andrei Gorodetsky, Univ. of Birmingham (United Kingdom), ITMO Univ. (Russian Federation); Nikolay S. Balbekin, Maksim S. Kulya, Bogdan V. Sokolenko, Nikolay V. Petrov, ITMO Univ. (Russian Federation)
On demand
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In this contribution, we discuss the features of design and polarimetric inspection of terahertz achromatic waveplates. The design of the crystalline quartz half-wave plate was performed taking into account the ellipticity and the introduced phase difference between the orthogonal components of the output radiation polarization vector. The designed waveplate are relatively thin, work equally efficiently in the frequency range from 0.4 to 1.4 THz, and, most importantly, are cheap to manufacture. The modification of the experimental terahertz time-domain spectroscopy polarimetric setup involving direct waveform detection is proposed. The proposed polarimetry THz time-domain spectrometer with electro-optic detection shows parasitical signals absence and easier measurement procedure.
11906-59
Author(s): Joselito E. Muldera, Univ. of Fukui (Japan); Jessica Pauline C. Afalla, Univ. of Tsukuba (Japan); Takashi Furuya, Hideaki Kitahara, Univ. of Fukui (Japan); Elmer S. Estacio, Univ. of the Philippines (Philippines); Katsuhiko Saito, Qixin Guo, Saga Univ. (Japan); Masahiko Tani, Univ. of Fukui (Japan)
On demand
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We demonstrate that titanium-doped lithium niobate strip optical waveguides can act as terahertz emitters. Terahertz pulses were produced by pumping with a femtosecond laser at a wavelength of 1.55 µm via the prism-coupled Cherenkov-phase matching scheme. Near-single cycle time-domain pulses were generated and the terahertz time-domain peak signal from the 40-µm waveguide was found to be ~18% higher than that observed with bulk crystal. The THz power spectra revealed a broad bandwidth and high signal-to-noise ratio. These findings signify the feasibility of titanium-in-diffusion to produce strong terahertz radiation from titanium-doped lithium niobate waveguides.
Conference Chair
Capital Normal Univ. (China)
Conference Chair
The Institute of Optics, Univ. of Rochester (United States)
Conference Chair
Masahiko Tani
Univ. of Fukui (Japan)
Program Committee
The Univ. of Adelaide (Australia)
Program Committee
Shanghai Institute of Microsystem and Information Technology (China)
Program Committee
Nanjing Univ. (China)
Program Committee
The Institute of Optics, Univ. of Rochester (United States)
Program Committee
P.N. Lebedev Physical Institute of the Russian Academy of Sciences (Russian Federation), Texas A&M Univ. at Qatar (Qatar)
Program Committee
Jiaguang Han
Ctr. for Terahertz Waves of Tianjin Univ. (China)
Program Committee
Zhi Hong
China Jiliang Univ. (China)
Program Committee
National Tsing Hua Univ. (Taiwan, China)
Program Committee
Nanjing Univ. (China)
Program Committee
Beijing Institute of Technology (China)
Program Committee
Fengqi Liu
Institute of Semiconductors, Chinese Academy of Sciences (China)
Program Committee
Nankai Univ. (China)
Program Committee
National Chiao Tung Univ. (Taiwan, China)
Program Committee
Zhejiang Univ. (China)
Program Committee
RIKEN (Japan)
Program Committee
Osaka Univ. (Japan)
Program Committee
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (China)
Program Committee
Purple Mountain Observatory, Chinese Academy of Sciences (China)
Program Committee
M.V. Lomonosov Moscow State Univ. (Russian Federation)
Program Committee
The Univ. of Seoul (Korea, Republic of)
Program Committee
Xianghong Tang
Hangzhou Dianzi Univ. (China)
Program Committee
Anton N. Tcypkin
ITMO Univ. (Russian Federation)
Program Committee
Masayoshi Tonouchi
Osaka Univ. (Japan)
Program Committee
Xiaojun Wu
Beihang Univ. (China)
Program Committee
Northwest Univ. (China)
Program Committee
Minzu Univ. of China (China)
Program Committee
Univ. of Wollongong (Australia)
Program Committee
National Univ. of Defense Technology (China)
Program Committee
LiangLiang Zhang
Capital Normal Univ. (China)
Program Committee
Oklahoma State Univ. (United States)
Program Committee
Capital Normal Univ. (China)
Program Committee
Yaxin Zhang
Univ. of Electronic Science and Technology of China (China)
Program Committee
Capital Normal Univ. (China)
Program Committee
China Univ. of Petroleum (China)
Program Committee
National Univ. of Defense Technology (China)
Program Committee
Shanghai Normal Univ. (China)
Program Committee
China Academy of Engineering Physics (China)
Program Committee
Univ. of Shanghai for Science and Technology (China)
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