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Active broadband unidirectional focusing of terahertz surface plasmons based on a liquidcrystal-integrated on-chip metadevice

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Photonics Research 2024年第10期12卷 2148-2157页

作者： YI-MING WANG FEI FAN HUI-JUN ZHAO JING LIU YUN-YUN JI JIE-RONG CHENG SHENG-JIANG CHANG Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern OpticsNankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

Surface plasmons have been given high expectations in terahertz(THz)on-chip photonics with highly bound integrated transmission and on-chip wavefront ***,most surface plasmonic coupling strategies with tailorable polarization-dependent features are challenged in broadband propagation and dynamic *** this work,a liquid crystal(LC)-integrated surface plasmonic metadevice based on arc-arrayed pair-slit resonators(APSRs)is *** mirror-symmetry structures of this metadevice achieve the spin-selective unidirectional achromatic focusing,of which the broadband characteristic is supported by containing multiple APSRs with slits of different sizes corresponding to different excitation ***,arc radii are precisely designed to meet the phase matching condition of constructive interference,so that the operating frequency of this on-chip metadevice is broadened to 0.33–0.60 ***,the LC integration provides the active energy distribution between the left and right focal spots,and the actual modulation depth reaches up to 73%.These THz active,wideband,on-chip manipulation mechanisms and their devices are of great significance for THz-integrated photonic communication,information processing,and highly sensitive sensing.

关键词： polarization unidirectional crystal

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Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces

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Photonics Research 2022年第4期10卷 1097-1106页

作者： Hui-Jun Zhao Fei Fan Tian-Rui Zhang Yun-Yun Ji Sheng-Jiang Chang Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

To enhance and actively control terahertz(THz) anisotropy and chirality, we have designed and fabricated a THz composite device with a liquid crystal(LC) layer and Si anisotropic metasurface. By initial anchoring and electrically rotating the spatial orientation of the LC optical axis, the different symmetry relationships are obtained in this hybrid device. When the optical axis of LC is parallel or perpendicular to the optical axis of the Si metasurface, the anisotropy of the device will be enhanced or offset, which leads to a tunable phase-shift range of more than 180°. When there is an angle between the two optical axes, due to the destruction of the mirror symmetry in the LC-Si anisotropic medium, the highest circular dichroism of the device reaches 30 dB in the middle orientation state of the LC optical axis, and the active modulation can be realized by changing the bias electric field on the LC layer. This composite device demonstrates rich characteristics for the feasible manipulation of THz polarization conversion and chiral transmission, which can be applied in THz polarization imaging and chiral spectroscopy.

关键词： anisotropy anisotropic crystal

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Active terahertz beam manipulation with photonic spin conversion based on a liquid crystal Pancharatnam–Berry metadevice

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Photonics Research 2022年第11期10卷 2658-2666页

作者： HUI-JUN ZHAO FEI FAN YUN-YUN JI SONG-LIN JIANG ZHI-YU TAN SHENG-JIANG CHANG Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

Active terahertz (THz) beam manipulation is urgently needed for applications in wireless communication, radar detection, and remote sensing. In this work, we demonstrate a liquid crystal (LC) integrated Pancharatnam–Berry(PB) metadevice for active THz beam manipulation. Through theoretical analysis and simulation design, the geometric phase of the PB metasurface is engineered to match the tunable anisotropic phase shift of LCs under an external magnetic field, and dynamic beam deflection accompanied by spin conversion is obtained. The experimental results show that the device realizes a dynamic modulation depth of >94% and maximum efficiency of over 50% for the different spin states. Moreover, due to the broadband operating characteristics of devices at 0.7–1.3 THz, the deflection angles are frequency dependent with a scanning range of over ±20° to ±32.5°.Moreover, the two conjugate spin states are always spatially separated in different deflection directions with an isolation degree of over 10 dB. Therefore, this metadevice provides a scheme of active THz beam deflection and spin state conversion, and it also achieves both controllable wavelength division multiplexing and spin division multiplexing, which have important potential in large-capacity THz wireless communication.

关键词： beam deflection Berry

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Propagation and self-healing properties of Lommel-Gaussian beam through atmospheric turbulence

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optoelectronics Letters 2021年第9期17卷 572-576页

作者： CHEN Xiang YUAN Yabo YAN Baoluo ZHANG Ruoyu LIU Haifeng LU Zehui LIU Bo China Academy of Space Technology Xi'an 710100China Beijing Institute of Tracking and Telecommunication Technology Beijing 100094China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300350China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

The superposition of basic non-diffracting beams triggered new research hotspots lately,laying opportunities for long-distance wireless optical *** Lommel-Gaussian(LMG)beam formed by the superposition of Bessel-Gaussian light not only possesses non-diffraction feature,but also has tunable *** the help of Poynting vector analysis,we observed a smaller radial energy flow component during the propagation of the high order symmetrical LMG beam,which allows it to maintain the original beam profile over long *** to the energy oscillation of the mainlobe and sidelobes,the mainlobe blocked by the symmetrical LMG beam can be ***,the random phase screen with angular spectrum method is used to describe the beam behaviors in *** results show that the symmetry LMG is preferred in free space optical communication,and the asymmetric LMG performs poorly due to asymmetric energy transfer.

关键词： healing beam Gaussian

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Research on High-Precision and Low-Power Quartz MEMS Gyroscope Signal Demodulation Circuit Based on AFE and FPGA Fusion

Research on High-Precision and Low-Power Quartz MEMS Gyrosco...

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2023 International Conference on sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2023

作者： Li, Jiawei Sun, Xinyue Shi, Yuchen Ren, Yichen Zhao, Ergang Yue, Zhao College of Electronic Information and Optical Engineering Nankai University Tianjin China Smart Sensing Interdisciplinary Science Center of Nankai University Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin China

ISBN: (纸本)9798350318012

Mainstream quartz MEMS gyroscope signal demodulation methods are coherent demodulation methods, and the sensitivity of phase limits their accuracy improvement. In order to improve the accuracy of quartz MEMS gyroscope signal demodulation and achieve low-power gyroscope signal demodulation, a high-precision and low-power quartz MEMS gyroscope signal demodulation circuit based on AFE and FPGA fusion is proposed: The FPGA circuit uses simplified non-phase-sensitive amplitude discrimination algorithm and second-order IIR low-pass filter to build demodulation circuit;The AFE circuit uses low-power single point DFT algorithm based on CORDIC algorithm for demodulation. Then performs dual circuit fusion to improve demodulation accuracy. The high-precision quartz MEMS gyroscope signal demodulation circuit is achieved with a scale factor of 6.4 mV/°/s, relative error of 1.14%, and data variance of 0.39. By detecting the rate of change in angular velocity, it switches to a single circuit to achieve low-power signal demodulation goals, the minimum operating power consumption is about 79mW. © 2023 IEEE.

关键词： Demodulation

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Depth extraction method with high accuracy in integral imaging based on moving array lenslet technique

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optoelectronics Letters 2018年第2期14卷 148-151页

作者：王尧尧张娟赵雪微宋丽培张勃赵星 Key Laboratory of Optical Information Science and Technology Ministry of Education of China Institute of Modern Optics Nankai University Tianjin 300350 China Tianjin Key Laboratory of Optoelectronie Sensor and Sensing Network Technology Nankai University Tianjin300350 China

In order to improve depth extraction accuracy, a method using moving array lenslet technique(MALT) in pickup stage is proposed, which can decrease the depth interval caused by pixelation. In this method, the lenslet array is moved along the horizontal and vertical directions simultaneously for N times in a pitch to get N sets of elemental images. Computational integral imaging reconstruction method for MALT is taken to obtain the slice images of the 3 D scene, and the sum modulus(SMD) blur metric is taken on these slice images to achieve the depth information of the 3 D scene. Simulation and optical experiments are carried out to verify the feasibility of this method.

关键词： Depth extraction method with high accuracy in integral imaging based on moving array lenslet technique

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Side-hole-fiber based microfluidic biosensor for label-free DNA hybridization kinetics detection

Side-hole-fiber based microfluidic biosensor for label-free ...

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Optical Fiber sensors, OFS 2018

作者： Song, Binbin Liu, Bo Zhang, Hao Wu, Jixuan Zhang, Xu Liu, Haifeng Huang, Wei School of Computer Science and Engineering Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin300350 China

A label-free DNA hybridization biosensor based on side-hole-fiber integrated microfluidic devices has been proposed. Employing its birefringence adjustable feature, the hybridization detections of complementary matchi... 详细信息

ISBN: (纸本)9781943580507

关键词： Biosensors

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Strong terahertz chiral manipulation in double-layer metasurface sandwiched with ultrathin liquid crystals 17

Strong terahertz chiral manipulation in double-layer metasur...

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17th National Conference on Laser technology and optoelectronics

作者： Jiang, Xinhao Ji, Yunyun Fan, Fei Chang, Shengjiang Institute of Modern Optics Nankai University Tianjin300350 China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China

ISBN: (纸本)9781510661097

Strong terahertz chiral manipulation plays a vital role in polarization imaging, chiral spectroscopy, and multichannel communications. Here, a composite structure based on the double-layer metasurface sandwiched with the ultrathin liquid crystal layer is proposed to realize a strong terahertz chiral manipulation. On account of breaking mirror symmetry in the propagation direction and the local field enhancement effect in the cavity, the composite structure possesses a strong terahertz chiral response. Moreover, this terahertz chiral response can achieve a large tuning range by changing the optical axis of the liquid crystal: the experimental co-polarization circular dichroism can achieve a large controllable range of −31dB to 30dB at 0.772 THz and a chirality control range from 11dB to −22dB at 0.759 THz. This composite device demonstrates rich characteristics for the feasible manipulation of THz chiral response, which has greatly promoted the development and practical application of THz polarization and chiral control devices. © 2022 SPIE.

关键词： Liquid crystals

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Thin-core fiber-optic biosensor for DNA hybridization detection

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optoelectronics Letters 2018年第5期14卷 346-349页

作者： LONG Shao-cong ZHU Yan-ru HU Mu-yun QI Yi-fan JIANG Yun-rui LIU Bo and ZHANG Xu Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300350China

A real-time label-free DNA biosensor based on thin-core fiber(TCF) interferometer is demonstrated experimentally. The proposed biosensor is constructed by splicing a TCF between two segments of single mode fibers(SMFs) and integrated into a microfluidic channel. By modifying the TCF surface with monolayer poly-l-lysine(PLL) and single-stranded deoxyribonucleic acid(ssDNA) probes, the target DNA molecules can be captured in the microfluidic channel. The transmission spectra of the biosensor are measured and theoretically analyzed under different biosensing reaction processes. The results show that the wavelength has a blue-shift with the process of the DNA hybridization. Due to the advantages of low cost, simple operation as well as good detection effect on DNA molecules hybridization, the proposed biosensor has great application prospects in the fields of gene sequencing, medical diagnosis, cancer detection and environmental engineering.

关键词：生物传感器分子杂交 DNA 光纤脱氧核糖核酸反应过程环境工程 TCF

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Analysis of Base Stations Deployment on Power Saving for Heterogeneous network

Analysis of Base Stations Deployment on Power Saving for Het...

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2017 17th IEEE International Conference on Communication technology (ICCT 2017)

作者： Yuanhong Lv Hui Zhang Sui Xueming NanKai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology

With the increasing of energy consumption in the wireless network, Heterogeneous network(Het Net) is used to improve the capability of communication networks, save transmitting power of base stations(BSs), enhance the coverage of communication network and so on. Designing an energy efficient network should not only consider the energy efficient operation of BSs, but also take the energy efficiency of mobile devices(MDs) into account. This paper considers the energy efficiency of BSs and MDs and studies the power saving of Het Net from a more comprehensive and systematic perspective. This paper mainly analyzes the deployment of a certain number of micro BSs in the region which has a certain number of macro BSs, and compares the power saving indicator at different radius of the micro BSs in three algorithms, which are that the region-based deployment algorithm, the grid-based deployment algorithm and the greedy BSs deployment algorithm. The greedy BSs deployment algorithm is used to determine the most suitable positions of micro BSs, in order to maximize the overall power saving indicator of the entire Het Net.

关键词： HetNet energy efficiency power saving Base Stations Deployment mobile device

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