Article
Materials Science, Multidisciplinary
Haishan Tian, Yang Yang, Jiao Tang, Leyong Jiang, Yuanjiang Xiang
Summary: A multilayer structure is proposed to enhance the photonic spin hall effect of the reflected light at terahertz frequencies by controlling the Fermi energy and relaxation time of graphene. It is demonstrated that the spin behavior of the composite structure is highly sensitive to the incidence angle and dispersion characteristics of the spacer layer. This proposed structure shows great potential for designing new photonic devices based on the photonic spin hall effect at terahertz band.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jiajun Wang, Lei Shi, Jian Zi
Summary: We theoretically propose and experimentally demonstrate the spin Hall effect of light in photonic crystal slabs using momentum-space topological vortices around BICs. Our findings reveal spin-related topological effects around BICs, opening up possibilities for the application of BICs in integrated spin-optical devices and information processing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Liang Peng, Hang Ren, Ya-Chao Liu, Tian-Wei Lan, Kui-Wen Xu, De-Xin Ye, Hong-Bo Sun, Su Xu, Hong-Sheng Chen, Shuang Zhang
Summary: Researchers have discovered a transversely spinning light-induced spin Hall effect on the interface of a metamaterial, leading to beam shift. This unconventional effect, with geometrodynamical nature, can be controlled through the orientation of the photons' spin and provides a previously unexplored mechanism for manipulating light-matter interactions at interfaces.
Article
Physics, Multidisciplinary
Mehdi Molaei, Nicholas G. Chisholm, Jiayi Deng, John C. Crocker, Kathleen J. Stebe
Summary: Understanding the flow dynamics created by particle motion at interfaces is crucial for studying hydrodynamic interactions and colloidal self organization. Correlated displacement velocimetry has been developed to measure flow fields around interfacially trapped particles, providing key insights into the interface's mechanical response. The flow structure also contains information about interfacial properties and hydrodynamic coupling with the bulk fluid, enabling predictions of the interface's response to applied complex forces.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Keqiang Yin, Chi Zhang, Shenping Wang, Jie Jiang, Leyong Jiang
Summary: In this paper, the magnetically tunable and enhanced photonic spin Hall effect (PSHE) of reflected light beam at terahertz frequencies is achieved by using a multilayer structure with anisotropic graphene. The enhanced PSHE phenomenon is due to the excitation of surface plasmon polaritons (SPPs) at the interface between two dielectric materials. The PSHE of the reflected light can be enhanced and tuned by harnessing the anisotropic conductivity of graphene, making it promising for various applications in nanophotonics.
Article
Optics
Jie Cheng, Yinjie Xiang, Gaojun Wang, Jiahao Xu, Peng Dong, Bin Li, Fengfeng Chi, Shengli Liu
Summary: This paper proposes a simple method to enhance the photonic spin Hall effect. By using gradient-refractive-index materials, the photonic spin Hall effect of reflected light can be enhanced. The experimental results show that the use of doubly linear gradient-refractive-index materials can significantly enhance the photonic spin Hall effect. These findings are of great significance for the future development of spin-based photonic devices.
Article
Multidisciplinary Sciences
Hemant Kumar Sharma, Shreekantha Sil, Ashok Chatterjee
Summary: In this study, we investigate the spin-torque-dependent Spin Hall phenomenon in a two-dimensional tight-binding system. By using theoretical models and calculation techniques, we explore the effects of spin-orbit interactions and impurity strength on the spin Hall angle, as well as the interplay between Rashba and Dresselhaus interactions on the spin-Hall effect.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Minkyung Kim, Dasol Lee, Junsuk Rho
Summary: This study proves that the spin Hall effect of light is independent of incident polarization and symmetrical in shift when the two linear polarization states have the same Fresnel coefficients. Under unpolarized incidence, the reflected beam is split into two circularly polarized components that undergo the same amount of splitting in opposite directions.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Upasana Baishya, Nitish Kumar, Nirmal K. Viswanathan
Summary: This study presents simulation and experimental results on measuring the spin Hall effect of light (SHEL) at approximately 0.12 degrees away from normal incidence. The measurement is achieved by detecting the transverse spin-shift caused by polarization variations in the reflected beam. This research opens up possibilities for applications in material characterization using retro-reflection geometry.
Article
Astronomy & Astrophysics
Andrey A. Shoom
Summary: This study investigates the gravitational Faraday effect and its dual spin-Hall effect of light in arbitrary, nonstationary, asymptotically flat space-times. These effects arise from the interaction between light polarization and space-time angular momentum, resulting in different phase velocities for left- and right-handed circularly polarized light.
Article
Multidisciplinary Sciences
Li-Ming Zhao, Yun-Song Zhou
Summary: The discovery of Photonic spin Hall effect (PSHE) on surface plasmon polaritons (SPPs) is an important progress in photonics. This paper proposes a method of realizing multi-channel PSHE in a two-dimensional metal-air-metal waveguide by modulating the phase difference phi and polar angle theta of the dipole source, allowing SPP to propagate along a specific channel. It is further proved that PSHE results from the component wave interference theory, enriching the application of SPPs in optical devices.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Yunpeng Wu, Shuoqing Liu, Shizhen Chen, Hailu Luo, Shuangchun Wen
Summary: This paper investigates two models for describing the behavior of light in graphene and proposes a method to detect the small difference between these models using the photonic spin Hall effect and weak-value amplification. Experimental results show that the zero-thickness model provides a more accurate description for the interaction between light and monolayer or bilayer graphene, while the slab model should be used for more than two layers.
Review
Optics
Minkyung Kim, Younghwan Yang, Dasol Lee, Yeseul Kim, Hongyoon Kim, Junsuk Rho
Summary: This article reviews the principle, recent developments, and applications of the spin Hall effect of light (SHEL). The theoretical description of the SHEL is provided, along with a comprehensive review of recent studies and applications. The future direction and prospects of the SHEL are also discussed.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Monu Nath Baitha, Kyoungsik Kim
Summary: In this study, the polarization-independent photonic spin Hall effect (PSHE) is achieved by manipulating the spin-orbit coupling of light. The thickness of the thin film can be adjusted to control the device's characteristic size. This finding will contribute to the development of polarization-independent nano-photonics devices.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
A. V. Shchepetilnikov, A. R. Khisameeva, Yu. A. Nefyodov, I. V. Kukushkin
Summary: The study found that even near full filling factors of the integer quantum Hall effect, electron spin resonance still existed even at large electron densities, and the ESR amplitude was comparable between even and odd fillings. This anomalous behavior suggests substantial spin polarization of even fillings, and was observed in AlAs quantum wells and ZnO/MgZnO heterojunctions.
Article
Optics
Zi-Mo Cheng, Shu-Tian Xue, Yan-Chao Lou, Pei Wan, Zhi-Cheng Ren, Jianping Ding, Xi-Lin Wang, Hui-Tian Wang
Summary: Rotational Doppler effect is a phenomenon that occurs when light passes through a rotating object and its angular momentum changes. It has been studied extensively in linear optics, but its application in nonlinear optics remains to be explored.
Article
Optics
Xinglin Wang, Wenxiang Yan, Yuan Gao, Zheng Yuan, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, Hui-Tian Wang
Summary: Structured optical fields containing polarization singularities have attracted much attention for their ability to maintain topological invariance during propagation. Progress has been made in mathematical description, generation and detection technologies, propagation dynamics, and applications. Manipulating polarization singularities with multiple degrees of freedom, especially in three-dimensional tailored optical fields, remains a crucial and difficult task. This study presents and demonstrates longitudinal polarization singularities obtained by superimposing Bessel-like modes with orthogonal polarization states on composite vector optical fields. The embedded singularities can be manipulated to propagate along arbitrary trajectories and undergo various transformations in 3D space, allowing flexible customization of their topological morphology and intensity patterns. The findings have implications for research in singular optics and applications such as micromanipulation, microstructure fabrication, and optical encryption.
PHOTONICS RESEARCH
(2023)
Article
Optics
Ke Wang, Jing Li, Fan Dai, Mengshuai Wang, Chuanhang Wang, Qiang Wang, Chenghou Tu, Yongnan Li, Huitian Wang
Summary: The generation of a quadratic soliton in a pulse-pumped microresonator has attracted significant interest in recent years due to its high efficiency and the influence of third-order nonlinearity. In this study, we explore the robustness of quadratic soliton generation in a degenerate optical parametric oscillator driven by a pulse pump with third-order nonlinearity. Our simulations demonstrate that the system is more resistant to perturbations in pump power, cavity detuning, and pump pulse width. These findings open up new possibilities for manipulating frequency comb in resonant microphotonic structures.
Article
Optics
Jingyuan Rao, Xian Long, Yuan Gao, Wenxiang Yan, Zheng Yuan, Hanchao Sun, Zhi-cheng Ren, Jianping Ding, Hui-tian Wang
Summary: In this paper, a new technique for achieving four-dimensional focal field modulation is proposed by combining a DMD and a vector field synthesis system based on a 4-f system. The high-speed modulation ability of DMDs enables versatile focus patterns to be fast switchable during the exposure time of the detector, forming multiple patterns in a single recording frame. Our proposed method is effective at improving the flexibility and speed of the focal field modulation, which is beneficial to applications.
Article
Physics, Applied
Weimin Chen, Wenbin Xiang, Chunzheng Bai, Baohua Zhu, Bing Gu, Changgui Lv, Jiayu Zhang
Summary: Amorphous GeSe films were prepared by vacuum thermal evaporation and exhibited polycrystalline phase after annealing. The films showed reverse saturable absorption and self-focusing phenomenon. The annealed recrystallized GeSe films had significantly improved nonlinear optical parameters and potential applications in optical limiting devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Li-Ting Wu, Ru-Zhi Luo, Xin-Zhe Zhang, Jing Chen
Summary: In this work, the guided modes in coupled waveguides made of negative-index materials without gain or loss are analyzed. It is shown that the existence of guided mode is influenced by the geometric parameters of the structure, exhibiting a non-Hermitian phenomenon. This effect, different from parity-time (PT) symmetry, can be explained by a simple coupled-mode theory with an anti-PT symmetry. The presence of exceptional points and slow-light effect are discussed. This study highlights the potential of loss-free negative-index materials in the field of non-Hermitian optics.
Article
Optics
Xiaoxue Li, Guanghao Rui, Jun He, Bing Gu
Summary: In this study, a non-Hermitian induced Su-Schrieffer-Heeger (SSH) lattice is designed, and the existence of diverse higher-order topological bound states in the continuum (BICs) is demonstrated. These hybrid states with an amplified and localized field have been shown to efficiently excite non-linear harmonic generation. The appearance of these topological bound states will advance the study of the interplay of topology, BICs, and non-Hermitian optics.
Article
Optics
Mingxian Guo, Wei Le, Chao Wang, Guanghao Rui, Zhuqing Zhu, Jun He, Bing Gu
Summary: Compared with the on-axis vortex beam and the off-axis single vortex beam, the off-axis double vortex beam has more control degrees of freedom and brings rich physical properties. In this work, the generation, topological charge (TC), and orbital angular momentum (OAM) of off-axis double vortex beams are investigated theoretically and experimentally. The tilted lens method is demonstrated to detect the magnitudes, signs, and spatial distribution of two TCs of the off-axis double vortex beam. Moreover, the average OAM of the off-axis double vortex beam can be easily controlled by changing the relative position of two-phase singularities, enabling applications in multi-degrees of freedom particle manipulation, optical communication, and material processing.
Article
Physics, Applied
Zhi-Hong Liu, Zi-Mo Cheng, Wen-Zheng Zhu, Hao Li, Bo-Wen Dong, Yan-Chao Lou, Zhi-Cheng Ren, Jianping Ding, Xi-Lin Wang, Hui-Tian Wang
Summary: In the frequency domain, a frequency comb is formed by the power spectrum density with evenly spaced discrete lines, which has become a fundamental concept in wave physics. Specifically, in the optical electromagnetic wavebands, an optical frequency comb is essential for precision measurement technologies and has been a significant breakthrough in modern physics. Extending the study of frequency combs to other wave regions is an interesting and important task, and one challenge is to develop a general method suitable for different waves. In this study, we demonstrate a general approach to generate a frequency comb based on a rotational Doppler effect with the orbital angular momentum (OAM) comb. By manipulating the essence of waves, we experimentally generate and verify frequency combs with up to 10 teeth. Our results not only provide a general way for generating frequency combs suitable for various waves, but also open up possibilities for applying frequency combs in different types of waves.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Cheng Ling, Shuang Cong, Yang Gao, Guanghao Rui, Jun He, Bing Gu
Summary: Spatial self-phase modulation (SSPM) of black phosphorus dispersed in agarose solid was investigated under excitation of on-axis and off-axis integer and half-integer vortex beams. The pattern of the far-field self-diffraction intensity was found to evolve from a ring to a tail as the off-axis distance of the Gaussian vortex beam increased. The size of the innermost tail for half-integer vortex beams was nearly half smaller than that of the second outer tail. The observed SSPM phenomenon was found to be related to the topological charge (TC) of the off-axis vortex beam.
RESULTS IN PHYSICS
(2023)
Article
Optics
Weiming Zhen, Xi -Lin Wang, Jianping Ding, Hui -Tian Wang
Summary: By introducing a vortex pair on the Gaussian beam, we can achieve both longitudinal and transverse asymmetrical spin splittings, as well as symmetrical ones via purely optical strategy. The symmetries of the spin splittings can be controlled flexibly by the tunable vortices, offering another degree of freedom for the photonic spin Hall effect. Based on the geometric phase theory, this study provides physical insights into the influence of vortices on the symmetry of the photonic spin Hall effect and offers potential methods for developing spin-based nanophotonic applications.
Article
Optics
Ru-Zhi Luo, Bo Zhao, Lin-Shan Sun, Li-Ting Wu, Tian-Jing Guo, Ming Kang, Jing Chen
Summary: This paper investigates the optical response of a parity-time (PT) symmetric diatomic meta-molecular array. It is found that PT symmetry can convert the initial dark antisymmetric mode of the diatomic meta-molecule into bright mode with a high-Q peak in the scattering spectrum. The Q factor can be controlled by manipulating the gain and loss magnitudes. Additionally, an abnormal phase-shift is achieved around this high-Q resonance, which persists even at exceptional point. The effective dielectric constant of the PT-symmetric meta-molecular array is modeled as an anomalous doubly-resonant Lorentz oscillator, different from those in electromagnetically induced transparency and Autler-Townes splitting. This study contributes to the advancements in non-Hermitian optics and slow light.
Article
Chemistry, Multidisciplinary
Yang Gao, Yueqiu Hu, Cheng Ling, Guanghao Rui, Jun He, Bing Gu
Summary: As an allotrope of phosphorus, layered violet phosphorus (VP) is widely used in electronics, photonics, and optoelectronics, but its nonlinear optical properties need further exploration. In this study, VP nanosheets were prepared and characterized, and their spatial self-phase modulation (SSPM) effects were investigated for all-optical switching applications. The SSPM ring forming time and the third-order nonlinear susceptibility of monolayer VP nanosheets were found to be about 0.4 s and 10(-9) esu, respectively. The results demonstrate the potential of two-dimensional nanomaterials for designing and realizing non-degenerate nonlinear photonic devices.
Article
Nanoscience & Nanotechnology
Liuhao Zhu, Xiaohe Zhang, Guanghao Rui, Jun He, Bing Gu, Qiwen Zhan
Summary: This study presents a novel optical skipping rope technology that transfers transverse orbital angular momentum to trapped particles, enabling their rotation and specific orbital motion parallel to the optical axis. This innovative technology significantly increases the manipulation freedom of optical tweezers, holding great significance for optical manipulation, micromechanics, and celestial orbit mimicry applications.
Article
Chemistry, Multidisciplinary
Wenbin Xiang, Baohua Zhu, Chunzheng Bai, Bing Gu, Changgui Lv, Jiayu Zhang
Summary: In this study, CdSe-CdS core-shell nanoplatelets were synthesized and the third-order nonlinear optical properties related to shell thickness were measured. The study found that the imaginary part of the third-order nonlinear susceptibility increased monotonically with the growth of shell thickness, while the real part showed a non-monotonic change. The trends were further explained by analyzing the optical properties and understanding the variations in defect distribution, exciton binding energy, and quantum confinement effects. The results highlighted the importance of proper shell passivation in enhancing the luminescent performance and third-order nonlinearity of the nanoplatelets.
