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学者姓名：王向峰
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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
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| 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 . |
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Rare-earth orthoferrites (RFeO3) have received significant attention due to their intricate magnetic interactions and potential applications in ultrafast spintronic devices. Among them, DyFeO3 exhibits rich magnetic phase transitions driven by the interplay between Fe3+ and Dy3+ sublattices. Previous studies mainly focused on temperature-induced spin reorientation near the Morin temperature (T-M similar to 50 K), but there has been limited exploration of magnetic phase behavior under external fields above T-M. This work aims to systematically investigate the temperature- and magnetic-field-dependent magneto-dynamic properties of a-cut DyFeO3 single crystals, with an emphasis on identifying novel phase transitions and elucidating the underlying mechanisms involving Fe3+-Dy3+ anisotropic exchange interactions. High-quality a-cut DyFeO3 single crystals are grown using the optical floating zone method and characterized by X-ray diffraction (XRD) and Laue diffraction. Time-domain terahertz spectroscopy (THz-TDS) coupled with a superconducting magnet (0-7 T, 1.6-300 K) is employed to probe the ferromagnetic resonance (FM) and antiferromagnetic resonance (AFMR) modes. By analyzing the frequency trends in the spectra, the response of internal magnetic moments to external stimuli can be inferred. In the zero magnetic field experiment, it is found that the temperature induced spin reorientation (Gamma(4)->Gamma(1)) occurs at Morin temperature (similar to 50 K) with temperature decreasing. A broadband electromagnetic absorption (0.45-0.9 THz) occurs below 4 K, which is attributed to electromagnons activated by broken inversion symmetry in the Dy3+ antiferromagnetic state. Above the Morin temperature, the absorption spectra of the sample are measured at constant temperatures (70, 77, 90, 100 K) and magnetic fields ranging from 0 to 7 T. The experimental results show that with the increase of magnetic field, a new magnetic phase transition occurs (Gamma(4) -> Gamma(24) -> Gamma(2) -> Gamma(24) -> Gamma(2)), and the critical magnetic field of the phase transition varies with temperature. The phase transitions arise from the competition between external magnetic fields and internal effective fields generated by anisotropic Fe3+-Dy3+ exchange. These findings contribute to the further understanding of the magnetoelectric effects in RFeO3 systems and provide a roadmap for using field-tunable phase transitions to design spin-based devices.
Keyword ：
magnetic phase transition magnetic phase transition magnetic resonance magnetic resonance rare-earth orthoferrite rare-earth orthoferrite terahertz terahertz
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| GB/T 7714 | Su, Haobin , Zheng, Shiyun , Wang, Ning et al. A new magnetic phase transition above Morin temperature in DyFeO3 [J]. | ACTA PHYSICA SINICA , 2025 , 74 (8) . |
| MLA | Su, Haobin et al. "A new magnetic phase transition above Morin temperature in DyFeO3" . | ACTA PHYSICA SINICA 74 . 8 (2025) . |
| APA | Su, Haobin , Zheng, Shiyun , Wang, Ning , Zhu, Guofeng , Ju, Xuewei , Huang, Feng et al. A new magnetic phase transition above Morin temperature in DyFeO3 . | ACTA PHYSICA SINICA , 2025 , 74 (8) . |
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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
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| 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 . |
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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
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| 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 . |
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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, magnetic nanocomposite films were prepared using magnetorheological fluids and were characterized by time-domain terahertz spectroscopy. Applying magnetic field during the curing process of magnetorheological fluids makes Fe nanoparticles align into a chain-like structure. Permanent anisotropy is solidified in the films, resulting in a birefringence coefficient as high as 0.37 in a frequency range from 0.4 to 2.0 THz. The polarization state of terahertz wave can be converted by rotating the film at room temperature without external magnetic field. When the rotation angle is at 50 degrees- 60 degrees, the ellipticity is greater than 0.8 in the frequency range of 1.19-1.6 THz, indicating that the film can be used as a quarter waveplate.
Keyword ：
Birefringence coefficient Birefringence coefficient magnetorheologicalfluid (MRF) magnetorheologicalfluid (MRF) nanocomposite nanocomposite time-domain terahertz spectroscopy time-domain terahertz spectroscopy
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| GB/T 7714 | Chen, Yanqing , Zhu, Guofeng , Huang, Feng et al. Large Terahertz Birefringence in Nanocomposite Films Made From Magnetorheological Fluid [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
| MLA | Chen, Yanqing et al. "Large Terahertz Birefringence in Nanocomposite Films Made From Magnetorheological Fluid" . | IEEE TRANSACTIONS ON PLASMA SCIENCE (2024) . |
| APA | Chen, Yanqing , Zhu, Guofeng , Huang, Feng , Ju, Xuewei , Wang, Jiaxun , Guo, Cuixia et al. Large Terahertz Birefringence in Nanocomposite Films Made From Magnetorheological Fluid . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
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TmFeO3 具有磁光效应、多铁性和自旋重取向等丰富的物理特性,在凝聚态物理和材料物理领域具有重要的研究价值.本文利用时域太赫兹低温磁光谱,研究 TmFeO3 单晶在 1.6 K温度下自旋共振频率随外加磁场的变化规律,并表征其内部复杂的相互作用.结果表明,随磁场增加TmFeO3 单晶的准铁磁共振向高频移动,而准反铁磁共振在临界磁场(2.2-3.6 T)转变为准铁磁共振,通过磁结构分析和理论拟合,证实单晶磁矩发生了磁场诱导的自旋重取向.本研究有助于深入理解稀土正铁氧体在外磁场、温度场综合作用下,内部磁结构的调控机制,开发相关的自旋电子学器件.
Keyword ：
太赫兹 太赫兹 稀土正铁氧体 稀土正铁氧体 自旋重取向 自旋重取向 铁磁共振 铁磁共振
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| GB/T 7714 | 王宁 , 黄峰 , 陈盈 et al. 磁场诱导的TmFeO3单晶自旋重取向 [J]. | 物理学报 , 2024 , 73 (1) : 298-304 . |
| MLA | 王宁 et al. "磁场诱导的TmFeO3单晶自旋重取向" . | 物理学报 73 . 1 (2024) : 298-304 . |
| APA | 王宁 , 黄峰 , 陈盈 , 朱国锋 , 苏浩斌 , 郭翠霞 et al. 磁场诱导的TmFeO3单晶自旋重取向 . | 物理学报 , 2024 , 73 (1) , 298-304 . |
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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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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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TmFeO3 exhibits rich physical properties such as magneto -optical effect, multiferroicity, and spin reorientation, making it possess significant research value in condensed matter physics and materials science. In this study, we utilize a time -domain terahertz magneto -optical spectroscopy system to investigate the changes in spin resonance frequency of TmFeO3 single crystal at T = 1.6 K under external magnetic fields in a range of 0-7 T. The TmFeO3 sample is grown in an optical floating zone furnace and its crystallographic orientation is determined by using back -reflection Laue X-ray photography with a tungsten target. The measurement setup is a self -built time -domain terahertz magneto -optical spectroscopy system, with magnetic fields in a range of 0- 7 T, temperatures in a range of 1.6-300 K, and a spectral range of 0.2-2.0 THz. A pair of 1 mm -thick ZnTe nonlinear crystals is used to generate and detect terahertz signals through optical rectification and electro-optic sampling technique. The system variable temperature and magnetic field are controlled by a superconducting magnet. In experiments, a linearly polarized terahertz wave is vertically incident on the sample surface, and its magnetic component HTHz is parallel to the sample surface. By rotating the sample, the angle (0) between macroscopic magnetic moment M and HTHz can be tuned, achieving selective excitations of the two modes, that is, 0 = 0 for q-AFM mode and 90 degrees for q -FM mode. Terahertz absorption spectrum results indicate that as the magnetic field increases, the quasi -ferromagnetic resonance (q -FM) of TmFeO3 single crystal shifts towards high frequencies, and quasi-antiferromagnetic resonance (q-AFM) transits to q -FM under low critical magnetic fields (2.2-3.6 T). Through magnetic structure analysis and theoretical fitting, it is confirmed that the magnetic moment of the single crystal undergoes magnetic field induced spin reorientation. This study is helpful in better understanding of the regulation mechanism of the internal magnetic structure of rare earth ferrite under the combined action of external magnetic field and temperature field, and also in developing related spin electronic devices.
Keyword ：
ferromagnetic resonance ferromagnetic resonance rare earth orthoferrite rare earth orthoferrite spin reorientation spin reorientation terahertz terahertz
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| GB/T 7714 | Wang, Ning , Huang, Feng , Chen, Ying et al. Magnetic-field-induced spin reorientation in TmFeO3 single crystals [J]. | ACTA PHYSICA SINICA , 2024 , 73 (1) . |
| MLA | Wang, Ning et al. "Magnetic-field-induced spin reorientation in TmFeO3 single crystals" . | ACTA PHYSICA SINICA 73 . 1 (2024) . |
| APA | Wang, Ning , Huang, Feng , Chen, Ying , Zhu, Guo-Feng , Su, Hao-Bin , Guo, Cui-Xia et al. Magnetic-field-induced spin reorientation in TmFeO3 single crystals . | ACTA PHYSICA SINICA , 2024 , 73 (1) . |
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