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Conference 11906

Infrared, Millimeter-Wave, and Terahertz Technologies VIII

In person: 10 - 11 October 2021
On demand starting 10 October 2021
View Session ∨
  • 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
2021-09-19T19:20:38-07:00
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UPCOMING LIVE EVENTS:
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
Author(s): Qifang Peng, National Univ. of Defense Technology (China)
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 starting 10 October 2021
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The direct experimental image of the Lorentz contraction in the theory of relativity has not yet been visualized until now. Here, we demonstrate ultrafast visualization of the electric field contraction around picosecond electron beams with 35-MeV energy using femtosecond electro-optic sampling technique. The characteristic radiation pattern of the electric field, which propagates perpendicularly to the traveling direction of the electron beam, is experimentally observed. The spatio-temporal density profile of the electron bunch is deduced by solving the Gauss’ theorem with the obtained electric field profile.
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, Elmer S. Estacio, National Institute of Physics, Univ. of the Philippines Diliman (Philippines)
On demand starting 10 October 2021
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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 - 16:30
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
Author(s): Zhenyu Zhao, Shanghai Normal Univ. (China)
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, Li Qin, YongYi Chen, Jinlong Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China); Zhongyao Zhu, BRIMET (China)
In person: 10 October 2021 • 17:00 - 17:15 China Standard Time
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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)
In person: 10 October 2021 • 17:30 - 17:45 China Standard Time
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In this work, we propose a PT-symmetric OEO based on optoelectronics loops formed by microwave signals to an intensity modulator (IM) via the radio-fiber (RF) input and termination ports. The signals applied via the RF input and termination ports of an IM have different modulation efficiencies due to the velocity mismatch in the travelling-wave IM. The OEO loop is closed by propagating the modulated optical carrier in a long single mode fiber (SMF), recovering the signal to the electrical domain by a photodetector and feeding the signal back to the IM. 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.
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 starting 10 October 2021
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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, Lanjun Guo, Cheng Gong, Weiwei Liu, Institute of Modern Optics, Nankai Univ. (China)
In person: 11 October 2021 • 09:20 - 09:35 China Standard Time
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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)
In person: 11 October 2021 • 09:35 - 09:50 China Standard Time
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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, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
In person: 11 October 2021 • 09:50 - 10:05 China Standard Time
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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)
In person: 11 October 2021 • 10:30 - 11:00 China Standard Time
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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)
In person: 11 October 2021 • 11:15 - 11:30 China Standard Time
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Conventional coherent and noncoherent 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), high-density polyethylene foam (HDPE foam), high-resistivity silicon, sapphire and magnesium oxide and quartz substrates. Detailed measurement results under room temperature and cryostat temperature will be presented.
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 starting 10 October 2021
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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 starting 10 October 2021
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): Fengzhou Dai, Xidian Univ. (China); Hui Zhao, Xiaofei Lu, Jiuquan Satellite Launch Ctr. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-25
Author(s): Li Fan, Chen-Hao Gou, Zheng-Mao Wu, Guang-Qiong Xia, Zhu-Yu Ding, Southwest Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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 adopting optical injection, the seed 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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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, Nanjing Univ. of Science and Technology (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In order to effectively reconstruct millimeter-wave images within the framework of block CS, the adaptive sampling methods based on visual saliency and block information weight are proposed in this paper. Firstly, it shows that the coding matrix method of Gabor filter has higher PSNR of reconstructed image and faster reconstruction efficiency under the same sampling rate, when compared with the traditional coding matrixes. Then, in view of the irrationality of allocating the same amount of encoded data to different image blocks in the traditional block CS, the adaptive sampling methods are put forward and compared with other sampling methods. Some experimental results demonstrate that the proposed methods can effectively reduce the size of coding matrix and shorten the reconstruction time.
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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-30
Author(s): Wanlin Liang, Mengyuan Wang, Suqi Zhang, Qingli Zhou, Jian Zuo, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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, root mean square (RMS) delay spread, and the angle spread (AS) 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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-36
Author(s): Yue Dai, Hui Li, Yue Fei, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Qi Chen, Research Institute of Superconductor Electronics, Nanjing Univ. (China); Feiyan Li, Labao Zhang, Xiaoqing Jia, Lin Kang, Peiheng Wu, Research Institute of Superconductor Electronics, Nanjing Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-37
Author(s): Pandeng Wang, Jiuzhou Han, Qingyuan Yao, Xiaolei Wu, Jingsuo He, Bo Su, 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, 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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-39
Author(s): Yan Shen, Qingjun Li, Jing Ding, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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. The detector has a cut-off response wavelength of 11 μm. 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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-46
Author(s): Zijie Dai, Nankai Univ. (China); Manukumara Manjappa, Nanyang Technological Univ. (Singapore); Yunkun Yang, Faxian Xiu, Fudan Univ. (China); Ranjan Singh, Nanyang Technological Univ. (Singapore); Weiwei Liu, Nankai Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-48
Author(s): Hengshun Luan, Ning Tao, Capital Normal Univ. (China); Wei Liu, National Museum of China (China); Xue Yang, Sen Wang, Hui Sun, Jiangang Sun, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-49
Author(s): Li Wang, Ning Tao, Jiangang Sun, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-50
Author(s): Wei Fang, Xue Yang, Xangyu Wang, Gangbo Hu, Ning Tao, Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11906-53
Author(s): Longcheng Feng, Caihong Zhang, Nanjing Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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, Chunlian Li, Rui Jia, Jing Xu, 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, Ji Cao, Zhenwei Zhang, Capital Normal Univ. (China); Jianchao Li, Qing He, Institute of Surface Engineering Technologies, Chinese Academy of Sciences (China); Cunlin Zhang, Capital Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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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): Andrei Gorodetsky, Univ. of Birmingham (United Kingdom), ITMO Univ. (Russian Federation); Yaroslav V. Grachev, Nikolay S. Balbekin, Maksim S. Kulya, Aleksey V. Chernykh, Bogdan V. Sokolenko, Nikolay V. Petrov, ITMO Univ. (Russian Federation)
On demand starting 10 October 2021
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In this contribution, we present a refined approach to the design of terahertz super achromatic waveplates. We discuss the shortcomings of the techniques used in previous work and demonstrate the limited applicability of waveplates calculated using these techniques. It is shown that the calculation of achromatic components should be carried out taking into account the ellipticity and the introduced phase difference between the orthogonal components of the polarization of the output radiation. Compared to those presented in the scientific literature, our quarter-wave plates are thinner, work equally efficiently in the frequency range from 0.4 to 1.4 THz, and, most importantly, are cheaper to manufacture. Schemes for the assembly of achromatic terahertz half-wave plates are proposed, which make it possible to obtain eight-segment achromatic q-plates with charges 0.5 and 1. Similar achromatic plates in the THz frequency range have not been created before and have no analogs.
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 starting 10 October 2021
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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)
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)
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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