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Spin-dependent terahertz wavefront shaping based on hybrid phase in all-silicon chiral metasurfaces

Photonics Research 2025年第5期13卷 1271-1281页

作者： Li, Jie Chen, Leling Xu, Hang Nan, Tong Lu, Xueguang Li, Hui Xu, Wenhui Tan, Qi Li, Jitao Lv, Yuanyuan Liu, Tingting Xiao, Shuyuan Tang, Tingting Luo, Li Huang, Wanxia He, Jin Zhang, Yan Yao, Jianquan Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center College of Optoelectronic Engineering Chengdu University of Information Technology Chengdu610225 China School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China Key Laboratory of Terahertz Optoelectronics Ministry of Education Department of Physics Capital Normal University Beijing100048 China College of Materials Science and Engineering Sichuan University Chengdu610065 China School of Information Engineering Nanchang University Nanchang330031 China

Independent manipulation of orthogonal circularly polarized wavefronts is one of the important goals for meta-optics, and chiral nanophotonics is one of the crucial approaches. In this article, we propose a new scheme for spin-dependent terahertz wavefront shaping based on chiral metasurfaces, which involves a hybrid design of the propagation phase, chirality induced phase, and Pancharatnam-Berry phase in all-silicon meta-atoms. A controllable linear polarization conversion effect in the transmitted wave is obtained via breaking the mirror symmetry and preserving the C2 symmetry of the resonator, which causes a different form of the Jones matrix. By simultaneously adjusting the in-plane geometric dimensions and azimuth angle of chiral units, and utilizing the evolution characteristics of circularly polarized components in parameter space and polarization space, spin-dependent phase responses have been observed. We provide the main theoretical analysis and demonstrate the functional design of circularly polarized multiplexed beam deflection or vortex beam generation, through the expected simulation and experimental results near the operating frequency of 0.6 THz. Our results may enrich the design of terahertz polarization-multiplexed devices. © 2025 Chinese Laser Press.

关键词： Wavefronts

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Monolithic Integration of Acoustic Enrichment and Resonant Sensing for Trace Detection of Micro-Plastics

Monolithic Integration of Acoustic Enrichment and Resonant S...

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IEEE International Conference on Micro Electro Mechanical systems

作者： Yue Wang Wenqi Fan Liang Huang Jingui Qian Anhui Province Key Laboratory of Measuring Theory and Precision Instrument School of Instrument Science and Opto-Electronics Engineering Hefei University of Technology China State Key Laboratory of Millimeter Waves Southeast University China

ISBN: (数字)9798331508890

ISBN: (纸本)9798331508906

We present a novel technique that integrates acoustic enrichment and liquid-phase mass sensing on a single chip fabricated with a 3×3 piezoelectric micromachined resonator array (PMRA). A SiN barrier layer completely covers the surface of the PMRA, providing insulation and dustproof protection. The PMRA, connected in parallel, is driven solely by a single RF signal of 20 V for acoustic particles focusing within 30 seconds. The frequency shift after particles were loaded at the central area (1.75 kHz) is significantly larger than the random dispersion (1.05 kHz). This technique shows potential for point-of-care detection and identification of microplastics in seawater.

关键词： Micromechanical devices Sensitivity Pollution RF signals Monolithic integrated circuits Resonant frequency Acoustics Resonance Sensors Protection

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High quality 6-inch single-crystalline AlN template for E-mode HEMT power device

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Journal of Semiconductors 2025年第3期46卷 96-101页

作者： Zhiwen Liang Shangfeng Liu Ye Yuan Tongxin Lu Xiaopeng Li Zirong Wang Neng Zhang Tai Li Xiangdong Li Qi Wang Shengqiang Zhou Kai Kang Jincheng Zhang Yue Hao Xinqiang Wang Songshan Lake Materials Laboratory Dongguan 523808China Guangzhou Wide Bandgap Semiconductor Innovation Center Guangzhou Institute of TechnologyXidian UniversityGuangzhou 510555China School of Physical Sciences Great Bay UniversityDongguan 523808China Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials ResearchBautzner Landstrasse 40001328DresdenGermany Dongguan Institute of Opto-Electronics Peking University Dongguan 523808China Sinopatt.Technology Co. LtdSongshan LakeDongguan 523808China State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsNan-oOptoelectronics Frontier Center of Ministry of Education(NFC-MOE)Peking UniversityBeijing 100871China State Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071China

In the present work,the high uniform 6-inch single-crystalline AlN template is successfully achieved by high temperature annealing technique,which opens up the path towards industrial application in power ***,the outstanding crystalline-quality is confirmed by Rutherford backscattering spectrometry(RBS).In accompanied with the results from X-ray diffraction,the RBS results along both[0001]and[1213]reveal that the in-plane lattice is effectively reordered by high temperature *** addition,the constantΦ_(epi)angle between[0001]and[1213]at different depths of 31.54°confirms the uniform compressive strain inside the AlN *** from the excellent crystalline quality of AlN template,we can epitaxially grow the enhanced-mode high electron mobility transistor(HEMT)with a graded AlGaN buffer as thin as only~300 *** an ultra-thin AlGaN buffer layer results in the wafer-bow as low as 18.1μm in 6-inch wafer *** fabricated HEMT devices with 16μm-L_(GD)exhibits a threshold voltage(V_(TH))of 1.1 V and a high OFF-state breakdown voltage(V_(BD))over 1400 ***,after 200 V high-voltage OFF-state stress,the current collapse is only 13.6%.Therefore,the advantages of both 6-inch size and excellent crystallinity announces the superiority of single-crystalline AlN template in low-cost electrical power applications.

关键词： single-crystalline allium nitride template E-mode HEMT

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Port-controllable routing of orbital angular momentum modes using a rotatable diffractive neural network

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Science China(Physics,Mechanics & Astronomy) 2025年第06期Mechanics & Astronomy) .卷 158-167页

作者： Junmin Liu Jiafu Chen Qingji Zeng Zemin Liang Xinping Wu Xin Zhao Jiangnan Xiao Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen University College of New Materials and New Energies Shenzhen Technology University Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical System Terahertz Science Cooperative Innovation Center School of Optical-Electrical Computer Engineering University of Shanghai for Science and Technology Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University School of Information and Electronics Beijing Institute of Technology

Orbital angular momentum(OAM) modes provide an additional orthogonal physical dimension, offering transformative potential for enhancing optical communication capacity. Despite significant progress in mode multiplexing, the development of robust communication networks faces persistent challenges, particularly in effectively routing and controlling these multiplexed channels among network nodes. To tackle these dilemmas, we propose a rotatable diffractive neural network(R-DNN) strategy and demonstrate its capability for port-controllable OAM mode routing. By leveraging the correlation between the orthogonal evolution of OAM modes in free space and phase modulations during propagation, the R-DNN precisely shapes the spatial evolution of mode fields through multiple rotatable phase layers, enabling efficient routing to specific output ports. This approach exploits the interaction of secondary wavelets with the relative states of the rotatable layers, allowing on-demand control of mode evolution paths and enhancing routing flexibility. As a proof of concept, we developed a tri-functional router that successfully directs three OAM modes to individually controllable output ports. This router achieves an average intermode crosstalk of less than-16.4 dB across three functional states, one-dimensional, two-dimensional, and cross-connected switching, while supporting the routing of 5.85 Tbit/s quadrature phase-shift keying signals. These results highlight the R-DNN's effectiveness in achieving precise and controllable OAM mode manipulation, paving the way for advanced applications in mode-multiplexed communication networks and beyond.

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Integrated laser processing platform based on metasurface

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opto-Electronic Advances 2025年第2期8卷 1-4页

作者： Mingbo Pu National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of SciencesChengdu 610209China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China

Laser processing technologies enable the precise fabrication of arbitrary structures and devices with broad applications in micro-optics,micro-mechanics,and ***,its adoption is limited by the large size,complexity,high cost,and low flexibility of optical *** enable precise multidimensional control of light fields,aligning well with the development trend toward compact,high-performance optical ***,we review several recent studies on the application of metasurfaces in laser processing technologies,including 3D nanolithography,direct laser writing,and laser *** provide an integrated operational platform with exceptional performance,poised to disrupt conventional laser processing *** combination presents significant cost efficiency and substantial development potential,with promising applications in areas such as imaging,optical storage,advanced sensing,and space on-orbit manufacturing.

关键词： laser processing two-photon polymerization direct laser writing laser cutting metasurface

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Cost-effective enhancement of SPR performance via spectral shaping techniques

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Applied Optics 2025年第13期64卷 3494-3501页

作者： Liu, Ziyu Feng, Zhiwei Xia, Guo Shu, ShunLong Wei, YongQing Zhang, Hui Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei University of Technology Anhui Hefei230009 China School of Instrument Science and Opto-Electronics Engineering Hefei University of Technology Hefei230009 China School of Food and Biological Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Special Display Technology of the Ministry of Education National Engineering Laboratory of Special Display Technology National Key Laboratory of Advanced Display Technology Academy of Photoelectric Technology Hefei University of Technology Hefei230009 China

Surface plasmon resonance (SPR) technology has been widely applied in various fields, such as biosensing, environmental monitoring, food safety, and drug screening. However, the signal-to-noise ratio (SNR) of SPR sensors varies with wavelength and greatly affects their performance due to the fact that optics and sensors work differently for varying wavelengths of light. To address this issue, this paper proposes a simple and effective spectral shaping method based on a multi-field-of-view spectrometer combined with a mask. The amount of light received by the sensor is controlled by the mask, which provides uniform spectral intensity at different wavelengths of the SPR and improves the consistency of measurement accuracy. The results show that the spectral shaping method using the mask can reduce the difference in SNR at different resonance wavelengths by about 70% and reduce the difference in measurement accuracy by about 85%. Moreover, the method is expected to facilitate the wider application of SPR technology in more fields due to its low cost and positive effects. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved. © 2025 Optica Publishing Group.

关键词： Biosensors Phase modulation Sensor performance Surface plasmon resonance Surface plasmons Total internal reflection

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Insb/Janus Mosse Van Der Waals Heterostructure: First-Principles Calculation Study of Electronic Structure and Optical Properties

SSRN

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SSRN 2025年

作者： Qin, Xuebing Wang, Xuewen Zhao, Yingying Ye, Shengyun Hilal, Muhammad Zhang, Weibin Guo, Jie College of Physics and Electronics Information Yunnan Key Laboratory of Opto-Electronic Information Technology Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials-Ministry of Education Yunnan Normal University Kunming650500 China Department of Semiconductor System Engineering Sejong University Seoul05006 Korea Republic of

Highlights● The proposal of the InSb/Janus MoSSe van der Waals heterojunction and the investigation of its electronic structure and optical properties have been conducted.● The InSb/Janus MoSSe van der Waals heterojunction has a bandgap of 0.56 eV, is a direct bandgap semiconductor, and is classified as a Type II heterojunction.● The InSb/Janus MoSSe van der Waals heterojunction exhibits a broad spectral absorption range, spanning from the ultraviolet to the infrared regions.● The InSb/Janus MoSSe van der Waals heterojunction possesses strong light-harvesting capabilities. © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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A Novel Coprime Nested Array with Enhanced DOFs and Reduced Mutual Coupling for DOA Estimation of Noncircular Sources

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IEEE Transactions on Vehicular technology 2025年 1-13页

作者： Peng, Zhe Gong, Qishu Xie, Huikai School of Integrated Circuits and Electronics Beijing100081 China BIT Chongqing Institute of Microelectronics and Microsystems Chongqing401332 China Beijing Institute of Control and Electronics Technology Key Laboratory of Information System and Technology Beijing100038 China

Recently, many sparse array configurations have been designed for direction of arrival (DOA) estimation of noncircular sources due to their capability of constructing high-performance difference-sum coarray. Nested array, coprime array, along with their improved structures are the most commonly used array configurations. Nested arrays could provide O(R2) degrees of freedom (DOFs) with only R sensors, but suffer from severe mutual coupling effect owing to closely arranged elements. Coprime arrays generally offer a lower number of DOFs than nested arrays, but are more robust to mutual coupling effect due to sparser array structure. Unfortunately, existing sparse arrays cannot possess the benefits of nested arrays and coprime arrays at the same time within the framework of difference-sum coarray. To compensate for the above shortcoming, we first analyze the nesting property for difference coarray, and generalize the nesting property to difference-sum coarray, allowing nearly half of the sensors to be removed from dense subarray. Then, a new nested configuration called thinned coprime nested array (TCNA) is proposed, whose dense subarray is a coprime structure that satisfies the aforementioned nesting property. TCNA can generate a comparable number of DOFs to nested arrays due to the nesting property between two subarrays. Meanwhile, the mutual coupling effect is greatly reduced since its dense subarray is replaced with a coprime structure, which limits the number of sensor pairs with small spacing. Therefore, TCNA is able to combine the advantages of both nested array and coprime array. Finally, simulations verify the superiority of TCNA with respect to DOF ratio, coupling leakage, and DOA estimation accuracy. © 1967-2012 IEEE.

关键词： Direction of arrival

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Optical modulation of photoluminescence in carbon quantum dots using diarylethene molecular photoswitches[Invited]

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Chinese Optics Letters 2025年第2期 87-92页

作者：陈柯舟孟祥禹栾庆鑫 Bo Albinsson 侯丽丽刘铁根 School of Precision Instrument and Opto-electronics Engineering Tianjin University Key Laboratory of Opto-electronics Information Technology Tianjin University Department of Chemistry and Chemical Engineering Chalmers University of Technology

Modulating photoluminescent（PL） materials is crucial for applications such as super-resolution microscopy. The combination of PL materials and photoswitches can achieve this aim by utilizing isomerization of the *** we report an optically PL switchable system by mixing carbon quantum dots（CQDs） and diarylethene（DAE） molecular photoswitches. The PL on/off states of CQDs, switched with alternating visible and UV light, achieve a PL on/off ratio of500 and stable reversibility over 20 cycles. The mechanism of our design is revealed by PL lifetime measurements,temperature-dependent PL spectroscopy, and density functional theory（DFT） calculations, confirming that efficient static quenching and the inner filter effect between CQDs and closed DAEs are the keys to achieving such outstanding performance.

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Impulse response modeling of vanadium dioxide microbolometers at different pulse repetition frequencies

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Journal of the Optical Society of America A 2025年第6期42卷 745-753页

作者： Rui Yu Dong Wang Biyi Wang Xingning Geng Jining Li Kai Zhong Yuye Wang Degang Xu Jianquan Yao School of Precision Instrument and Optoelectronics Engineering Institute of Laser and Optoelectronics Tianjin University Tianjin 300072 China Key Laboratory of Optoelectronics Information Technology (Ministry of Education) Tianjin University Tianjin 300072 China Key Laboratory of Micro Opto-electro Mechanical System Technology (Ministry of Education) Tianjin University Tianjin 300072 China National Key Laboratory of Electromagnetic Space Security Tianjin 300308 China xudegang@***

This paper investigates the optical absorption characteristics of uncooled vanadium dioxide ( ${{\rm VO}_2}$ ) microbolometers at different temperatures and wavelengths. Based on the optical properties of ${{\rm VO}_2}$ materials and typical microbolometer structures, a model of their impulse response at different pulse repetition frequencies is constructed under transient Dirichlet conditions. Under the same average power, the higher the pulse repetition frequency is, the higher the laser energy efficiency and the higher the grayscale value. Experimental measurements are conducted on the irradiation characteristics of a low pulse repetition frequency laser, and the results are consistent with the simulation results, both showing a step effect near 200 Hz. These results will contribute to the application of ${{\rm VO}_2}$ microbolometers in active imaging and laser detection fields.

关键词： Effective medium theory Effective refractive index High power lasers Laser imaging Optical absorption Optical properties

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