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学者姓名：王向峰
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Abstract ：
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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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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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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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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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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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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本发明提出一种基于介质超表面的太赫兹光束偏折器及其设计方法，采用二氧化硅作为光束偏折器的基底材料和光栅单元材料；利用两个一维光栅周期性排列构建光束偏折器的单元结构；设置入射光偏振态、工作频率、入射角；通过设计固定厚度的光栅及基底尺寸，以排列周期为优化变量来调制入射光的相位，并且有选择地将大部分入射光散射到+1衍射级，同时抑制其他衍射级的强度；加入厚度优化变量，通过对两个宽度不同的光栅的尺寸、周期排列、基底厚度进行优化，最终得到能够将入射光引导到非常大的偏转角，并在广泛的偏转角范围内具有高的偏转效率的太赫兹光束偏折器。本发明中的偏折器能够实现大角度偏转、损耗小且易于加工、偏转效率高。
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| GB/T 7714 | 黄峰 , 吴泽波 , 陈佳强 et al. 基于介质超表面的太赫兹光束偏折器及其设计方法 : CN202111218403.X[P]. | 2021-10-19 00:00:00 . |
| MLA | 黄峰 et al. "基于介质超表面的太赫兹光束偏折器及其设计方法" : CN202111218403.X. | 2021-10-19 00:00:00 . |
| APA | 黄峰 , 吴泽波 , 陈佳强 , 陈燕青 , 王向峰 . 基于介质超表面的太赫兹光束偏折器及其设计方法 : CN202111218403.X. | 2021-10-19 00:00:00 . |
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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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