中国矿业大学 信息与控制工程学院,江苏 徐州 221116
该文提出了一种由单边复合周期人工表面等离子体激元(SSPPs)波导和叉指谐振器构成的新型小型化低通双陷波滤波器。该滤波器首先去除了传统SSPPs滤波器的模式转换结构,有效地减小了滤波器的尺寸,从而实现滤波器的小型化。此外,该滤波器分别在SSPPs传输线和底部金属板引入叉指谐振器,从而产生两个传输零点,实现了两个可独立调谐的陷波。仿真与实测结果均表明,该文所提出的滤波器具有较高的传输效率,其截止频率为8.3 GHz,带内的回波损耗低于16.6 dB,陷波抑制均达到20 dB。
人工表面等离子体激元 小型化 复合周期 陷波 spoof surface plasmon polaritons (SSPPs) miniaturization composite periodic notch
Author Affiliations
Abstract
1 Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, China
2 Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
3 Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China, Chongqing University, Chongqing 400044, China
Flat optical elements have attracted enormous attentions and act as promising candidates for the next generation of optical components. As one of the most outstanding representatives, liquid crystal (LC) has been widely applied in flat panel display industries and inspires the wavefront modulation with the development of LC alignment techniques. However, most LC elements perform only one type of optical manipulation and are difficult to realize the multifunctionality and light integration. Here, flat multifunctional liquid crystal elements (FMLCEs), merely composed of anisotropic LC molecules with space-variant orientations, are presented for multichannel information manipulation by means of polarization, space and wavelength multiplexing. Specifically, benefiting from the unique light response with the change of the incident polarization, observation plane, and working wavelength, a series of FMLCEs are demonstrated to achieve distinct near- and far-field display functions. The proposed strategy takes full advantage of basic optical parameters as the decrypted keys to improve the information capacity and security, and we expect it to find potential applications in information encryption, optical anti-counterfeiting, virtual/augmented reality, etc.
multifunctional liquid crystal holography information multiplexing Opto-Electronic Advances
2023, 6(4): 220063
Author Affiliations
Abstract
Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
In this paper, Cd1-xZnxS thin films were prepared by chemical bath deposition (CBD), and the effects of different zinc doping content on the morphological structure and optical properties of Cd1-xZnxS buffer layers are systematically discussed. The experimental results show that in the deposition process of different substrates, the crystal structure of the film is all hexagonal, and when the concentration of zinc sulfate (ZnSO4) precursor is varied from 0 to 0.025 M, the films are uniform and dense. With the increase of zinc content, the X-ray diffraction (XRD) peak of the films shifted behind that of CdS film (002). It showed 70% to 90% transmittance in the visible region and the optical band gap increased gradually. The band gap value of the films obtained ranged from 2.43 eV to 3.01 eV. It shows the potential feasibility of its application to photovoltaic devices.
光电子快报(英文版)
2023, 19(1): 25
Author Affiliations
Abstract
1 Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
2 Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
We propose a chip-integratable cylindrical vector (CV) beam generator by integrating six plasmonic split ring resonators (SRRs) on a planar photonic crystal (PPC) cavity. The employed PPC cavity is formed by cutting six adjacent air holes in the PPC center, which could generate a CV beam with azimuthally symmetric polarizations. By further integrating six SRRs on the structure defects of the PPC cavity, the polarizations of the CV beam could be tailored by controlling the opening angles of the SRRs, e.g., from azimuthal to radial symmetry. The mechanism is governed by the coupling between the resonance modes in SRRs and PPC cavity, which modifies the far-field radiation of the resonance mode of the PPC cavity with the SRR as the nano-antenna. The integration of SRRs also increases the coupling of the generated CV beam with the free-space optics, such as an objective lens, promising its further applications in optical communication, optical tweezer, imaging, etc.
vector beams photonic crystal plasmonics integrated photonics Chinese Optics Letters
2023, 21(3): 033601
1 中国电子科技集团公司光电研究院, 天津
2 空军装备部驻天津地区第三军事代表室, 天津
为了满足精简多波段激光设备光路的技术需求, 选取ZnS、YbF3两种材料, 在ZnSe基底上完成了45°入射条件下长、短波红外合束镜的设计。引入修正系数, 结合误差分析, 解决了测量光谱与设计曲线不吻合的问题。最终制备的合束镜在入射角为45°时, 在λ=(10.6±0.2) μm波段透过率>95%, 在λ=(780±10) nm、(808±10) nm、(880±10) nm、(915±10) nm波段反射率>97%, 在λ=630~680 nm波段的透过率约为41.825%。所制备的合束镜具有良好的环境适应性, 满足系统的技术需求。
光学薄膜 合束镜 分光膜 硒化锌 optical Film beam combiner spectroscopic film ZnSe
中国矿业大学 信息与控制工程学院, 江苏 徐州 221116
该文介绍了一款环形耦合的圆形贴片天线。采用圆形金属贴片作为天线的辐射贴片, 通过在介质板上引入两个谐振环, 产生两个新的工作谐振频段。通过调节圆形贴片和耦合环之间的高度, 进一步拓宽了天线的工作频段。通过3D打印技术对不规则的介质基板进行加工制作, 有效解决了传统加工方法加工难度大及生产周期长的问题。测试结果表明, 该天线在3.8~5.8 GHz工作频段内, 回波损耗小于-10 dB; 在5.1 GHz时, 天线增益达到8.4 dBi; 天线相对带宽为42%, 且具有良好的全向辐射特性。天线的测试结果与仿真结果基本吻合。
圆形贴片天线 耦合环 3D打印技术 全向辐射 circular patch antenna coupling ring 3D printing technology omnidirectional radiation
1 哈尔滨工业大学 物理学院,哈尔滨
2 空军装备部驻北京地区军事代表驻天津地区第三军事代表室,天津
采用时间相关单光子计数技术的激光雷达具有更高的灵敏度,而利用偏振探测技术可以增加对目标的识别能力。搭建了基于偏振检测的时间相关单光子计数成像系统,对不同材质、相同和不同深度的目标进行了成像。结果表明,在单脉冲回波光子数0.04个的情况下,能够利用偏振探测方法获得目标回波的偏振信息,且对比强度图像和深度图像,偏振图像中目标的边缘更加清晰。
偏振成像 时间相关单光子计数 光电探测 目标识别 polarization imaging time-correlated single-photon counting photoelectric detection target identification
福州京东方光电科技有限公司,福建 福州350300
为分析TFT-LCD线残像, 研究了画面驱动数据电压通过电容(CDC)对公共电压的影响。首先根据实际膜层分布, 描述电容在膜层的具体构成, 并建立电路等效模型, 测量并分析TFT-LCD实际工作状态的电容。然后, 建立方法测试棋盘格画面公共电压畸变并分析其造成线残像的机理。最后, 设置“黑灰条”画面使畸变量最大化以便于分析畸变的形成过程和影响因素。实验结果表明: TFT开关关闭时呈现高阻态, CDC仅为公共电压和数据电压金属线交叠电容(C0), 电容值为55 fF; TFT完全打开时呈现低阻态, CDC由存储电容和C0并联构成, 电容值为530 fF; 当TFT处于中间态时, 测试得到的电容值为中间值。电容值越大, 数据电压转换速度越快, 畸变量越大。降低转换速度(48 ns→53 ns), 可减小畸变量(2.67 V→2.61 V)。
线残像 电容 公共电压 TFT-LCD TFT-LCD line image sticking capacitance common voltage