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学者姓名：居学尉
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Abstract ：
针对高性能太赫兹功能器件的规范化设计需求,本文将智能逆向设计方法应用于太赫兹带通滤波器的设计与优化中.建立与数字空间映射的亚波长超表面等效模型,从设定器件的目标功能和约束条件出发,利用智能算法探索整个解空间中的全部可能结构,迭代寻优至最优结构图案.本文利用搭建的逆向设计框架设计了中心频率为0.51 THz、带宽为41.5 GHz、插入损耗为–0.1071 dB的太赫兹带通滤波器.与传统的人工正向设计相比,逆向设计方法可解构出窄带、低插入损耗、带外抑制强、极化稳定性强的带通滤波器.
Keyword ：
太赫兹超表面 太赫兹超表面 数字编码 数字编码 映射建模 映射建模 逆向设计 逆向设计
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| GB/T 7714 | 居学尉 , 张林烽 , 黄峰 et al. 数字型太赫兹带通滤波器的逆向设计及优化 [J]. | 物理学报 , 2024 , 73 (06) : 50-57 . |
| MLA | 居学尉 et al. "数字型太赫兹带通滤波器的逆向设计及优化" . | 物理学报 73 . 06 (2024) : 50-57 . |
| APA | 居学尉 , 张林烽 , 黄峰 , 朱国锋 , 李淑锦 , 陈燕青 et al. 数字型太赫兹带通滤波器的逆向设计及优化 . | 物理学报 , 2024 , 73 (06) , 50-57 . |
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In this paper, an ingenious reverse design method is applied to the design and optimization of terahertz bandpass filters in order to achieve standardized design of high-performance terahertz functional devices. An equivalent model of subwavelength metasurface mapped to digital space is established. Based on ideal objective functions and constraints, intelligent algorithms begin a bold journey to explore the vast potential structure in the solution space. Through iterative refinement, the algorithm reveals optimal structural patterns, unlocking areas of unparalleled performance. The direct binary search (DBS) algorithm and the binary particle swarm optimization (BPSO) algorithm are compared in optimization process. When using the DBS algorithm to optimize the design area, it takes a long time to poll the logic states of all pixel units point by point, and it is easy to get stuck in the local optimal value. However, BPSO algorithm has stronger global search capabilities, faster convergence speed, and higher accuracy. Through a comprehensive comparison of the device performance optimized by the two algorithms, the solution optimized by BPSO algorithm has better out-of-band suppression performance and a narrower full width at half peak, but slightly lower transmittance at the center frequency. The bandpass filter has a center frequency of 0.51 THz, a bandwidth of 41.5 GHz, and an insertion loss of -0.1071 dB. When considering computational efficiency, DBS algorithm lags behind, the simulation time is 11550 s, while BPSO algorithm only needs 9750 s. Compared with the traditional forward design, the reverse design method can achieve the narrower band, lower insertion loss, better out-of-band suppression and polarization stability. The fine structural changes of the optimal results have a significant influence on spectral performance, demonstrating the superiority and uniqueness of reverse design. This technology contributes to the design and optimization of high-performance and novel functional devices.
Keyword ：
digital encoding digital encoding mapping and modeling mapping and modeling reverse design reverse design terahertz metasurface terahertz metasurface
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| GB/T 7714 | Ju Xue-Wei , Zhang Lin-Feng , Huang Feng et al. Reverse design and optimization of digital terahertz bandpass filters [J]. | ACTA PHYSICA SINICA , 2024 , 73 (6) . |
| MLA | Ju Xue-Wei et al. "Reverse design and optimization of digital terahertz bandpass filters" . | ACTA PHYSICA SINICA 73 . 6 (2024) . |
| APA | Ju Xue-Wei , Zhang Lin-Feng , Huang Feng , Zhu Guo-Feng , Li Shu-Jin , Chen Yan-Qing et al. Reverse design and optimization of digital terahertz bandpass filters . | ACTA PHYSICA SINICA , 2024 , 73 (6) . |
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In this work, we present a reverse-design method for 1-D disordered waveguide structures which might be used for future terahertz on-chip integrated systems. This method is based on the Anderson localization effect to construct the initial structure of the waveguides. Due to the probability statistical distribution, the waveguides with randomly generated fluctuations have different localization abilities. We optimized the refractive index fluctuations and distributions of the waveguide structure through intelligent reverse-design algorithms and ultimately obtained the optimal structural parameters. Simulation results indicate that the optimized waveguide has a better localization ability, a lower insertion loss, and a good robustness against fabrication errors and defects compared to the initial waveguide.
Keyword ：
Anderson localization Anderson localization Biomedical optical imaging Biomedical optical imaging Electric fields Electric fields Fluctuations Fluctuations Location awareness Location awareness Optical fibers Optical fibers Optical waveguides Optical waveguides Refractive index Refractive index reverse-design reverse-design terahertz terahertz waveguide waveguide
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| GB/T 7714 | Chen, Yanqing , Qin, Binhua , Liang, Beiyuan et al. Reverse Design of Terahertz Waveguide Structures Based on Anderson Localization [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
| MLA | Chen, Yanqing et al. "Reverse Design of Terahertz Waveguide Structures Based on Anderson Localization" . | IEEE TRANSACTIONS ON PLASMA SCIENCE (2024) . |
| APA | Chen, Yanqing , Qin, Binhua , Liang, Beiyuan , Ju, Xuewei , Guo, Cuixia , Huang, Feng et al. Reverse Design of Terahertz Waveguide Structures Based on Anderson Localization . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
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In this work, we investigate photon localization and filtering effects in disordered scattering structures which might be used for future on-chip terahertz integrated systems. Through a reverse-design platform based on a discrete binary particle swarm optimization (BPSO) algorithm, a 2-D periodic dielectric cylindrical photonic crystal was transformed into a disordered scattering structure. Appropriate objective and figure of merit (FOM) functions are defined in order to achieve terahertz filtering function based on Anderson localization. The filters are in the bandgap range of 0.177-0.303 THz, with a FWHM bandwidth of 0.01 THz. We found that photon localization in disordered scattering structures is caused by coupling and resonance between adjacent microcavities.
Keyword ：
Disordered scattering structures Disordered scattering structures photonic crystal photonic crystal reverse-design reverse-design terahertz terahertz
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| GB/T 7714 | Chen, Yanqing , Xiong, Shixin , Huang, Feng et al. Terahertz Localization and Filtering Effects in Two-Dimensional Disordered Scattering Structures [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
| MLA | Chen, Yanqing et al. "Terahertz Localization and Filtering Effects in Two-Dimensional Disordered Scattering Structures" . | IEEE TRANSACTIONS ON PLASMA SCIENCE (2024) . |
| APA | Chen, Yanqing , Xiong, Shixin , Huang, Feng , Guo, Cuixia , Chen, Ying , Wang, Xiangfeng et al. Terahertz Localization and Filtering Effects in Two-Dimensional Disordered Scattering Structures . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
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Compared to other parts of the electromagnetic spectrum, the terahertz frequency range lacks efficient polarization manipulation techniques, which is impeding the proliferation of terahertz technology. In this work, we demonstrate a tunable and broadband linear-to-circular polarization converter based on an InSb plate containing a free-carrier magnetoplasma. In a wide spectral region (similar to 0.45 THz), the magnetoplasma selectively absorbs one circularly polarized mode due to electron cyclotron resonance and also reflects it at the edges of the absorption band. Both effects are nonreciprocal and contribute to form a near-zero transmission band with a high isolation of -36 dB, resulting in the output of a near-perfect circularly polarized terahertz wave for an incident linearly polarized beam. The near-zero transmission band is tunable with magnetic field to cover a wide frequency range from 0.3 to 4.8 THz.
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| GB/T 7714 | Ju, Xuewei , Hu, Zhiqiang , Zhu, Guofeng et al. Creating a near-perfect circularly polarized terahertz beam through the nonreciprocity of a magnetoplasma [J]. | OPTICS EXPRESS , 2023 , 31 (23) : 38540-38549 . |
| MLA | Ju, Xuewei et al. "Creating a near-perfect circularly polarized terahertz beam through the nonreciprocity of a magnetoplasma" . | OPTICS EXPRESS 31 . 23 (2023) : 38540-38549 . |
| APA | Ju, Xuewei , Hu, Zhiqiang , Zhu, Guofeng , Huang, Feng , Chen, Yanqing , Guo, Cuixia et al. Creating a near-perfect circularly polarized terahertz beam through the nonreciprocity of a magnetoplasma . | OPTICS EXPRESS , 2023 , 31 (23) , 38540-38549 . |
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In this study, we utilized time-domain terahertz magneto-optical spectroscopy to investigate the spin resonance in a c-cut TmFeO3 single crystal at T = 1.6 K under different magnetic fields and characterized its intricate internal interactions. By selectively exciting the magnetic resonance modes in the crystal, we found that as the magnetic field increases, the quasi-ferromagnetic (q-FM) mode of TmFeO3 single crystal shifts towards higher frequencies, while the quasi-antiferromagnetic (q-AFM) mode transforms into the q-FM mode at low critical magnetic fields (2.2-3.6 T). Through magnetic structure analysis and theoretical calculations, it is confirmed that the magnetic moment of TmFeO3 undergoes a magnetic-field-induced spin reorientation from Gamma 2 to Gamma 4 phase. Materials with magnetic moment flipping at low magnetic fields may find applications for antiferromagnetic spintronic devices in the future.
Keyword ：
Antiferromagnetic spintronic devices Antiferromagnetic spintronic devices Magnetic resonance Magnetic resonance Spin reorientation Spin reorientation Terahertz Terahertz
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| GB/T 7714 | Wang, Ning , Zhu, Guofeng , Hu, Zhiqiang et al. Magnetic-field-induced spin reorientation in a c-cut TmFeO3 single crystal observed by terahertz spectroscopy [J]. | INFRARED PHYSICS & TECHNOLOGY , 2023 , 135 . |
| MLA | Wang, Ning et al. "Magnetic-field-induced spin reorientation in a c-cut TmFeO3 single crystal observed by terahertz spectroscopy" . | INFRARED PHYSICS & TECHNOLOGY 135 (2023) . |
| APA | Wang, Ning , Zhu, Guofeng , Hu, Zhiqiang , Ju, Xuewei , Su, Haobin , Huang, Feng et al. Magnetic-field-induced spin reorientation in a c-cut TmFeO3 single crystal observed by terahertz spectroscopy . | INFRARED PHYSICS & TECHNOLOGY , 2023 , 135 . |
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基于时域有限差分 (FDTD) 法, 对金属线栅结构的太赫兹 (THz) 偏振特性进行了仿真分析, 研究了占空比和金属层厚度对偏振特性的影响, 发现随着厚度的增加, 0.1～10THz范围内出现了周期性高透射现象.基于飞秒激光微加工技术制备了周期性金属线栅太赫兹偏振片, 利用时域太赫兹光谱系统进行了实验测试, 实验结果与仿真结果相吻合, 偏振片的消光比在40dB～45dB范围内, 偏振度为1, 显示了良好的偏振特性.
Keyword ：
偏振片 偏振片 太赫兹 (THz) 太赫兹 (THz) 时域有限差分 (FDTD) 法 时域有限差分 (FDTD) 法 激光技术 激光技术 飞秒激光微加工 飞秒激光微加工
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| GB/T 7714 | 陈燕青 , 高炳攀 , 林炎章 et al. 飞秒激光微加工制备金属线栅太赫兹偏振片 [J]. | 中国激光 , 2018 , 45 (8) : 93-98 . |
| MLA | 陈燕青 et al. "飞秒激光微加工制备金属线栅太赫兹偏振片" . | 中国激光 45 . 8 (2018) : 93-98 . |
| APA | 陈燕青 , 高炳攀 , 林炎章 , 居学尉 , 王杰 , 王向峰 . 飞秒激光微加工制备金属线栅太赫兹偏振片 . | 中国激光 , 2018 , 45 (8) , 93-98 . |
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