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2023 Annual IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2023

作者： Bai, Yifan Xiao, Bo Liu, Xuelian Wang, Chunyang Liang, Shuning Huang, Siling Zhao, Shijie Xi'an Technological University School of Optoelectronic Engineering Xi'an China Photoelectric Imaging Detection Technology Xi'an Key Laboratory of Active Xi'an China Xi'an Technological University Xi'an China Changchun University of Science and Technology School of Optoelectronic Engineering Changchun China Inner Mongolia Institute of Metal Materials Optoelectronic Laboratory Ningbo China Fine Optical Engineering Research Center Optoelectronic Laboratory Chengdu China

ISBN: (纸本)9798350344486

For non-confirmed processing for the ring pendulum double-sided polishing (RPDP), this article constructs a machining prediction model based on the motion principle and pressure distribution principle of the RPDP equipment, and conducts simulation experiments using the machining prediction model as a platform It was found that the instantaneous material reduction is mainly distributed within the radius range of the pendulum grinding disc at the center of the component. The distribution of the large instantaneous material reduction band does not exceed the radius range of the pendulum grinding disc at the center of the component, and is independent of changes in the size and swing mode of the pendulum grinding disc. The large instantaneous material reduction band contracts inward as the swing interval of the pendulum grinding disc moves outward. Based on this law, this article guides practical processing by cupper the surface profile of optical components from 2.27 λ(λ=632.8 ~nm) reduced to 1.85 λ, and the obtained processing rules can effectively guide actual processing. © 2023 IEEE.

关键词： Pendulums

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Transverse spin and energy flow in Kerker scattering

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Physical Review A 2024年第2期109卷 023518-023518页

作者： Zhaolou Cao Chunjie Zhai Jiangsu International Joint Laboratory on Meteorological Photonics and Optoelectronic Detection Nanjing University of Information Science and Technology Nanjing 210044 China Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean Nanjing University of Information Science and Technology Nanjing 210044 China Department of Information Technology Nanjing Police College Nanjing 210046 China

In this paper, we investigate the characteristics of transverse spin and energy flow in Kerker scattering by a high refractive-index nanosphere based on the rigorous Mie scattering theory. It is found that the spin is quasi-transverse to the direction of energy flow everywhere in Kerker scattering and the magnitude of transverse spin is much larger than that in Rayleigh scattering due to the phase shift between scattered light of electric and magnetic dipoles. For the incidence of a linearly polarized plane wave, the transverse spin predominantly determines the direction of energy flow due to the spin-momentum locking effect in the near field. In the far field, the curl relationship between the energy flow and spin angular momentum density is validated analogously to structured guided waves. These findings help deepen understandings of unidirectional scattering and will be beneficial for the design of photonic nanoantennas.

关键词： Angular momentum of light Light-matter interaction Near-field optics

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Temperature-insensitive sensor based on U-shaped few-mode fiber for blood glucose brix measurement 21

Temperature-insensitive sensor based on U-shaped few-mode fi...

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21st International Conference on Optical Communications and Networks, ICOCN 2023

作者： Yu, Haozheng Tong, Zhengrong Dong, Miaoyun Zhang, Weihua Tianjin University of Technology Engineering Research Center of Optoelectronic Devices and Communication Technology Ministry of Education Tianjin Key Laboratory of Film Electronic and Communication Devices School of Integrated Circuit Science and Engineering Tianjin300384 China

ISBN: (纸本)9798350343502

In this study, a U-shaped few-mode fiber (FMF) sensor for blood glucose brix measurement is proposed, which is temperature-insensitive. These sensors with smaller bending diameters can be obtained by bending single-mode fiber (SMF)-FMF-SMF. The light leaks from fiber core to fiber cladding because the bending, which results in the occurrence of modal interference. The experiments show that the maximum blood glucose brix sensitivity is up to 1.081 nm / % in the blood glucose brix range of 0%-18%, when the bending diameter is ∼ 1 mm. And the sensors are temperature-insensitive in the temperature range of 10°C-40°C. The sensor has advantages of compact structure and high sensitivity. Therefore, the sensor is suitable for applications in fields such as biomedicine. © 2023 IEEE.

关键词： Single mode fibers

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Self-supervised Learning for Textured Surface Anomaly detection and Localization

Self-supervised Learning for Textured Surface Anomaly Detect...

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2022 International Conference on Mechatronics Engineering and Artificial Intelligence, MEAI 2022

作者： Wang, Feizhou Cheng, Fanyong Zhang, Mingyan Zhang, Hong Anhui Key Laboratory of Electric Drive and Control Anhui Polytechnic University Wuhu241000 China Anhui Province Key Laboratory of Detection Technology and Energy Saving Devices Anhui Polytechnic University Wuhu241000 China

ISBN: (纸本)9781510663169

Aiming at the problems of insufficient labeled samples and high missed detection rate in common textured surface anomaly detection, the paper designs a self-supervised learning model based on masked Autoencoder, which can realize accurate detection and location of anomalies without providing mass anomaly samples. Autoencoder is widely used, but it is difficult to detect and locate anomalies by reconstruction error due to its strong generalization ability reconstructed anomalies with small errors. Then, masked reconstruction method is proposed to reduce the generalization performance. First, each input image is masked to obtain multiple masked input images which are sequentially reconstruct by the Autoencoder. Second, these reconstructed images are complementarily masked and recombined to obtain the final reconstructed image. Finally, anomaly detection and localization are achieved by evaluating the reconstruction error between the input and reconstructed image. The experiment results indicate that the anomaly detection rate of this method is 95.09 % and the anomaly location rate is 93.32% under the anomaly detection standard metric，and the performance can be significantly improved. © 2023 SPIE.

关键词： Anomaly detection

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Accurate high-frequency measurement of electro-optic phase modulators based on optical spectrum analysis and microwave fixture de-embedding 15

Accurate high-frequency measurement of electro-optic phase m...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Wang, Simou Jing, Chao Xu, Ying Zhu, Junfeng Zou, Xinhai Zhang, Shangjian Microwave Photonics Research Center State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

High-speed electro-optic phase modulators (PMs) are critical devices in microwave photonics and optical communication. Optical spectrum analysis is widely used to measure the modulation depth of PMs thanks to simple structure and wide measurement frequency range. To further obtain the accurate frequency response especially the half-wave voltage of PMs, the microwave driving power input to the electrical port of PMs must be measured accurately. However, the source adapter network such as coaxial cables and connectors for connecting the microwave source and the PM under test will result in degraded response, which should be de-embedded. In this study, an improved optical spectrum analysis method is proposed to measure the frequency response of PMs based on microwave fixture de-embedding. In the proposed scheme, the microwave power transmitted from the microwave source to the PM is investigated by using signal flow graph to track the accurate driving power input to the PM, including transmission attenuation and impedance mismatch of the source adapter network and the PM. The accurate frequency response including modulation depth, half-wave voltage and relative response of the PM are obtained. In a proof-of-concept experiment, a commercial PM has been accurately measured in the frequency range of 1–30 GHz to demonstrate the feasibility of the proposed method. Our method fully calibrates the microwave power loss and the port impedance mismatch, which is applicable for those PMs even without good impedance match. Moreover, our method features simple structure and broadband measurement thanks to the optical spectrum analysis scheme. © 2024 SPIE.

关键词： Coaxial cables

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Antiferromagnetic Spin Fluctuations and Structural Transition in Cluster Mott Insulator Candidate Nb_(3)Cl_(8)Revealed by^(93)Nb-and^(35)Cl-NMR

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Chinese Physics Letters 2025年第3期42卷 153-166页

作者： Y.Z.Zhou X.Han J.Luo D.T.Wu A.F.Fang B.Shen B.J.Feng Y.G.Shi J.Yang R.Zhou Institute of Physics Chinese Academy of Sciencesand Beijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen UniversityGuangzhou 510275China School of Physics and Astronomy Beijing Normal UniversityBeijing 100875China Key Laboratory of Multiscale Spin Physics Ministry of EducationBeijing Normal UniversityBeijing 100875China

Motivated by recent studies of the cluster Mott insulator candidate compound Nb_(3)Cl_(8),this study performs^(93)Nb and^(35)Cl nuclear magnetic resonance(NMR)measurements to investigate the electron *** the structural transition temperature T_(s)∼97 K,all satellites of the^(93)Nb NMR spectra split into three distinct peaks,which suggests symmetry lowering due to the structural transition and could be attributed to the change in the Nb-Nb bond-lengths of the Nb3 *** spin-lattice relaxation rate 1/T_(1)divided by the temperature T,1/T_(1)T,increases upon cooling to T_(s)for all Cl sites,whereas only the Knight shift K of Cl located at the center of the Nb_(3) clusters exhibits a temperature dependence similar to that observed in magnetic *** findings collectively demonstrate the existence of strong spin correlations between the Nb atoms in Nb_(3)Cl_(8),which are closely associated with Mottness.

关键词： NMR ferromagnetic Transition

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Coherently Controlled Absorption of Few-Layered Electromagnetic Metamaterials 22

Coherently Controlled Absorption of Few-Layered Electromagne...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Zhang, Hongrui Yu, Hang Sun, Botian Lv, Bo Li, Yuxiang Shi, Jinhui Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Key Laboratory of In-Fiber Integrated Optics Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China

A kind of few-layered electromagnetic metamaterial has been designed to generate coherent perfect absorption phenomena in the terahertz band and the absorption can vary in the range of 0-1 according to the phase diffe... 详细信息

ISBN: (纸本)9798350367652

关键词： Terahertz waves

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Terahertz Sub-Wavelength Focusing and Negative Refraction Assisted Beam Transferring Based on 3-D Metamaterial Flat Lens Configurations

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Progress In Electromagnetics Research B 2023年 99卷 121-138页

作者： Marishwari, Muthusamy Subramanian, Venkatachalam Ouyang, Zhengbiao Yogesh, Natesan Chennai600025 India Microwave Laboratory Department of Physics Indian Institute of Technology Madras Chennai600036 India THz Technical Research Center of Shenzhen University Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Department of Physics National Institute of Technology Calicut Kerala Kozhikode673601 India

A flat lens made of a negative index (NI) metamaterial (MTM) focuses the diverging light waves with sub-wavelength resolution. However, to achieve tight 3-D focusing, one needs to realize a 3-D MTM with azimuthal and elevation focusing. In this work, a polarization-insensitive, wide-incident angle 3-D MTM showing an NI band of 0.34 THz (37%) centered at 0.92 THz is realized. A flat lens designed out of the proposed 3-D NI MTM shows sub-wavelength spot sizes of 0.48A 1 and 0.39A2 for cylindrical electromagnetic (EM) waves emanating out of an electric dipole source, at 0.9 THz and 0.95 THz, respectively. Also, the sub-wavelength focusing features of the NI flat slab are verified along non-symmetric planes by tilting the dipole source for different angles. It is also found that the finite flat slab configurations efficiently transfer EM beams for long conveyance lengths at NI frequencies. Thus, the realized flat slab configurations are useful for 3-D focusing requirements in optical trapping and imaging, and they are also useful for reducing the transmission losses associated with beam divergences. © (2023), (Electromagnetics Academy). All Rights Reserved.

关键词： Metamaterials

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Sensitivity optimization of fiber sensor based on two FBGs using microwave photonic interrogation technology 21

Sensitivity optimization of fiber sensor based on two FBGs u...

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21st International Conference on Optical Communications and Networks, ICOCN 2023

作者： Wang, Minghe Zhang, Ailing Hu, Guang Yan, Jinmeng Pang, Honggang Liu, Fei Chang, Pengxiang Wang, Junfeng College of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin Key Laboratory of Thin Film Electronics and Communication Devices Engineering Research Center of Optoelectronic Devices and Communication Technology Ministry of Education Tianjin China

ISBN: (纸本)9798350343502

Sensitivity optimization of fiber sensor based on two FBGs using microwave photonic interrogation technology is proposed and experimentally demonstrated. Two FBGs are attached on the upper and lower surfaces of a rectangular cantilever beam, which results in wavelength drift in opposite direction with external strain and same direction with temperature. As a result, the crosstalk caused by temperature is efficiently eliminated. The wavelength drift is converted into power variation of electrical signal by adopting the two taps microwave photonic filter response formed by two FBGs system. The effects of the modulation frequency and wavelength of the two FBGs on the system sensitivity are analyzed. In the experiment, the strain on two FBGs is demodulated by measuring the power of the recovered RF signal. © 2023 IEEE.

关键词： Fiber Bragg gratings

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3-D Metamaterial Based Terahertz Planoconcave Lenses for Linearly and Circularly Polarized Waves

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Progress In Electromagnetics Research B 2023年 98卷 21-37页

A three-dimensional negative index (NI) metamaterial (MTM) is realized at terahertz (THz) frequencies. The structure is composed of orthogonally oriented cross-bars with arrows on each corner embedded in a dielectric cube. The proposed 3-D MTM is symmetric along all the principal axes and shows a polarization-insensitive, wide-incident-angle negative refractive index regime centered at 0.862 THz with an operational bandwidth of 0.234 THz (27.15%). Using staircase approximation, the proposed 3-D NI MTM has been designed into a THz parabolic planoconcave lens (PCL). A PCL made of a NI medium is a counterpart of a positive index planoconvex lens and focuses on the nearfield region. The designed PCL shows 3-D focusing functionality for linearly and circularly polarized THz waves at 0.85 THz. The designed PCL has a short focal length and high numerical aperture (NA) with sub-wavelength focusing spot sizes. The computed FWHMs along transversal directions are 0.46A(x) x 0.49A(y) for transverse electric (TE) polarized wave, 0.46A(x) x 0.49A(y) for left-circularly polarized (LCP) wave, and 0.50A(x) x 0.42A(y) for right-circularly polarized (RCP) wave, respectively. The corresponding back focal lengths of the realized PCLs are 1.07A, 1.03A, and 0.98A, and the focal depths are 0.40A, 0.48A, and 0.41A for linear, LCP, and RCP waves, respectively. A short review of recent progress in manufacturing techniques for the fabrication of the proposed 3-D MTM is further highlighted. Since the proposed 3-D MTM PCL configurations show the far-field focusing of linearly/circularly polarized waves, imaging with high optical power requirements can be met for THz waveband applications. © (2023), (Electromagnetics Academy). All Rights Reserved.

关键词： Metamaterials

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