Query：
学者姓名：居学尉
Refining：
Year
Type
Indexed by
Source
Complex
Co-
Language
Clean All
Abstract ：
The importance of the terahertz (THz) region in wireless communication is increasing. THz tunable filters are key components for next-generation communication systems. In this article, we have designed a THz narrowband bandpass filter based on a double-layer frequency selective surface (FSS), which is composed of two X-shaped FSSs cascaded together with different geometric parameters. The center frequency of the double-layer structure is located between the center frequencies of the two single-layer FSSs. Based on the principle of inverse design, we employed intelligent algorithms to automatically optimize the structural parameters of the single-layer FSS. We simulated the transmission spectra of both single-layer and double-layer FSSs using finite-difference time-domain. Subsequently, FSSs were fabricated using femtosecond laser micromachining and characterized using time-domain THz spectroscopy. The experimental results are highly consistent with simulations. The designed double-layer filter exhibits a high Q factor and tunability of the center frequency by changing the spacing between the two FSS layers. Finally, based on an equivalent circuit model, we analyzed the transmission phenomenon of the nonequivalent double-layer FSS structure and attributed it to the resonances of equivalent capacitance and inductance between the FSS layers at different spacings. This approach can be applied to design tunable filters for other frequency bands.
Keyword ：
Band-pass filters Band-pass filters Equivalent circuit model (ECM) Equivalent circuit model (ECM) femtosecond laser micromachining femtosecond laser micromachining frequency selective surface (FSS) frequency selective surface (FSS) Micromachining Micromachining Microwave filters Microwave filters Optical filters Optical filters Periodic structures Periodic structures Resonant frequency Resonant frequency Resonator filters Resonator filters Structural engineering Structural engineering Terahertz communications Terahertz communications terahertz (THz) tunable bandpass filter terahertz (THz) tunable bandpass filter Time-domain analysis Time-domain analysis
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Yanqing , Huang, Feng , Liang, Beiyuan et al. A Frequency-Tunable Terahertz Bandpass Filter for Future Communication Systems [J]. | IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY , 2025 , 15 (3) : 481-486 . |
| MLA | Chen, Yanqing et al. "A Frequency-Tunable Terahertz Bandpass Filter for Future Communication Systems" . | IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 15 . 3 (2025) : 481-486 . |
| APA | Chen, Yanqing , Huang, Feng , Liang, Beiyuan , Su, Haobin , Ju, Xuewei , Wang, Xiangfeng . A Frequency-Tunable Terahertz Bandpass Filter for Future Communication Systems . | IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY , 2025 , 15 (3) , 481-486 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
稀土正铁氧体(RFeO3,R为稀土原子)包含Fe3+和R3+两套磁性离子亚晶格,存在Fe3+-Fe3+,Fe3+-R3+,R3+-R3+三种相互作用,它们是稀土正铁氧体丰富磁性的来源.本文利用时域太赫兹磁光谱,在1.6-300 K的温度范围内,在不同磁场下,测量a-cut DyFeO3单晶样品的吸收光谱,并分析光谱中铁磁(FM)和反铁磁共振(AFMR)吸收峰的温度和磁场依赖特性.在零磁场变温实验中,我们发现随温度降低在Morin温度(～50 K)出现的温度诱导的自旋重取向(Γ4→Γ1),以及在4 K温度以下存在一个由于电磁振子导致的宽带吸收.在Morin温度以上,我们在恒定温度(70,77,90,100 K)下测量了样品在0-7 T磁场范围的吸收光谱.实验结果表明,随着磁场的增大,存在一个新的磁相变过程(Γ4→Γ24→Γ2→Γ24→Γ2),相变的临界磁场随温度而变化.这一相变过程是由于外磁场和Fe3+-Dy3+的各向异性交换相互作用导致的内部有效场的相互竞争和对磁矩的协同作用.本项研究为深入理解稀土铁氧化物的丰富相变和磁电耦合特性,以及开发相关的自旋电子学器件提供参考.
Keyword ：
太赫兹 太赫兹 磁共振 磁共振 磁相变 磁相变 稀土正铁氧体 稀土正铁氧体
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 苏浩斌 , 郑世芸 , 王宁 et al. DyFeO3中高于Morin温度的新型磁相变 [J]. | 物理学报 , 2025 , 74 (8) : 247-253 . |
| MLA | 苏浩斌 et al. "DyFeO3中高于Morin温度的新型磁相变" . | 物理学报 74 . 8 (2025) : 247-253 . |
| APA | 苏浩斌 , 郑世芸 , 王宁 , 朱国锋 , 居学尉 , 黄峰 et al. DyFeO3中高于Morin温度的新型磁相变 . | 物理学报 , 2025 , 74 (8) , 247-253 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Polarization conversion is an important technique for converting the polarization state of electromagnetic waves. Based on the Fabry-Pérot (F-P) resonance enhancement in a multilayer metasurface structure, the reverse design of a broadband, highlyefficient and adjustable terahertz polarization converter using a multi-objective particle swarm optimization algorithm is demonstrated. The device is composed of three layers of metasurfaces cascaded together. The outer two layers are a pair of orthogonal grating structures, the middle layer is a sawtooth grating structure with a 45° angle to both sides of the grating, and the medium between the layers is air. Single-layer metasurfaces were prepared using femtosecond laser micro-machining, assembled through a cage structure, and the interlayer spacing was adjusted using two precision translation stages. The device was characterized using time-domain terahertz spectroscopy, and the experimental results were highly consistent with simulations, with a conversion efficiency of over 90%. In addition, the operating frequency of the device can be changed by adjusting the interlayer spacing. The F-P interference effect in the triple-layer structure plays a major role in the excellent characteristics of this device. The device structure can be used in the design of other adjustable/reconfigurable optical devices. © 1983-2012 IEEE.
Keyword ：
Fabry-Perot interferometers Fabry-Perot interferometers Femtosecond lasers Femtosecond lasers Fiber optic sensors Fiber optic sensors Laser beam machining Laser beam machining Laser materials processing Laser materials processing Micromachining Micromachining Nonlinear programming Nonlinear programming Photoelectric microscopes Photoelectric microscopes Shape optimization Shape optimization Structural optimization Structural optimization Terahertz spectroscopy Terahertz spectroscopy Terahertz waves Terahertz waves
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Chen, Yanqing , Huang, Feng , Wu, Xianyu et al. Near-Perfect Linear Terahertz Polarization Converter Design Based on Multi-Objective Optimization Algorithm [J]. | Journal of Lightwave Technology , 2025 , 43 (11) : 5407-5413 . |
| MLA | Chen, Yanqing et al. "Near-Perfect Linear Terahertz Polarization Converter Design Based on Multi-Objective Optimization Algorithm" . | Journal of Lightwave Technology 43 . 11 (2025) : 5407-5413 . |
| APA | Chen, Yanqing , Huang, Feng , Wu, Xianyu , Xu, Shengyao , Su, Haobin , Liang, Beiyuan et al. Near-Perfect Linear Terahertz Polarization Converter Design Based on Multi-Objective Optimization Algorithm . | Journal of Lightwave Technology , 2025 , 43 (11) , 5407-5413 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
In this work, a tunable microwave bandpass filter is designed based on a Fabry-P & eacute;rot interference (FPI) cavity, which consists of two nonequivalent FSSs. The upper and lower FSS layers are composed of periodic cross-type units of different sizes, thus having two different central frequencies. The transmission peak of the double-layer structure lies in between these two frequencies, having a narrow bandwidth (FWHM similar to 0.2 GHz) and is tunable by changing the cavity length. The two FSS layers were fabricated by laser machining on metal sheets. Single FSS layers and the double-layer structure were tested using a vector network analyzer in a microwave anechoic chamber, and their characteristics are consistent with CST simulation results and FPI theoretical calculations. Our method can be utilized to design tunable bandpass filters operating in other bands. These filters may be used for 5G and 6G communication systems. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Liang, Beiyuan , Chen, Yanqing , Huang, Feng et al. A new method for designing tunable bandpass filters [J]. | OPTICS EXPRESS , 2024 , 32 (26) : 46160-46166 . |
| MLA | Liang, Beiyuan et al. "A new method for designing tunable bandpass filters" . | OPTICS EXPRESS 32 . 26 (2024) : 46160-46166 . |
| APA | Liang, Beiyuan , Chen, Yanqing , Huang, Feng , Ye, Han , Ju, Xuewei , Chen, Ying et al. A new method for designing tunable bandpass filters . | OPTICS EXPRESS , 2024 , 32 (26) , 46160-46166 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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.
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
