Article
Multidisciplinary Sciences
Rujia Li, Liangcai Cao
Summary: This study utilizes topological modulation to solve the phase retrieval problem, using orbital angular momentum as a reliable modulation method and maintaining the robustness of topological charge l in atmospheric turbulence. Topological modulation offers an effective dynamic range of intensity constraints for reconstruction while avoiding stagnation issues during iteration.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Huicong Zhang, Tao Zhou, Chaoqing Dai
Summary: In this study, we report the experimental observation of the instability suppression of higher-order vortex solitons in cylindrical lead glass with thermal nonlocal nonlinearity. By using a coaxially propagating, mutually incoherent Gaussian beam, the vulnerable higher-order vortex soliton can be stabilized, forming a new type of soliton called Gauss-vortex vector soliton. The experimental results are in close agreement with the numerical simulations.
Article
Optics
Kunjian Dai, J. Keith Miller, Justin Free, Martyn Lemon, Fraser Dalgleish, Eric G. Johnson
Summary: This study demonstrates the generation of a spatially asymmetric perfect vortex (APV) basis using a pulsed 2D HOBBIT system, which holds potential for remote sensing applications. The results showcase the application of the APV basis in amplitude object pattern recognition and phase object wavefront sensing.
Article
Chemistry, Multidisciplinary
Da-Jie Yang, Ji-Cai Liu
Summary: In this study, efficient and selective high-order resonances were demonstrated in symmetric and asymmetric plasmonic nanoparticles using vortex beams. A pure high-order resonance was observed in symmetric nanoparticles configured with a complete nanoring lying on the focal center. Asymmetric nanoparticles configured with a complete ring off the beam center or a splitting nanoring showed multiple resonances influenced by the ring's geometry, position, orientation, and photon OAM. These findings contribute to the understanding and control of OAM-involved light-material interactions in asymmetric nanosystems.
Article
Optics
Hua Zhao, Zhen Zhang, Miaomiao Zhang, Yuanyuan Hao, Peng Wang, Hongpu Li
Summary: In this study, a broadband flat-top second-order orbital angular momentum (OAM) mode converter is proposed using a phase-modulated second-order helical long-period fiber grating (HLPG). The technology successfully achieves second-order OAM mode and flat-top effect simultaneously within a spectral bandwidth range, covering the entire C + L bands.
Article
Optics
Donghui Wang, Chengcheng Feng, Lingzhi Meng, Hongye Wang, Libo Yuan
Summary: A mixed multi-order vortex beam generator based on a Reuleaux triangle core fiber chiral grating is proposed, with the simultaneous coupling of the core mode and 1st- and 3rd-order vortex modes. The phase matching conditions and a cladding shrinkage method for flexible wavelength adjustment are analyzed. This new approach offers potential applications in fiber OAM communications, optical tweezers, and super-resolution imaging.
Article
Optics
Yonglei LIu, Zhen Dong, Fei Wang, Yahong Chen, Yangjian Cai
Summary: We propose a protocol to synthesize a class of vector beam array in the far field with periodic higher-order Poincare sphere (HOPS) polarization states by engineering the second-order spatial coherence structure of a partially coherent light source. The polarization state of a single HOPS beam at the source plane can be mapped into a beam array in the far field by engineering the spatial coherence of the beam source to have a lattice-like distribution. The degree of polarization of the generated HOPS beam array can be conveniently controlled by modulating the transverse spatial coherence width of the source. Our method provides an additional way to construct the structured beam array and may find applications, e.g., in multiparticle manipulations.
Article
Optics
Yuhang Wu, Andong Wang, Long Zhu
Summary: This paper proposes a novel network architecture that integrates convolutional layers and residual structures to compensate for the adverse effects of atmospheric turbulence on OAM beam transmission. By harnessing the local feature learning capability of convolutional layers and the information-preserving function of residual structures, the proposed network can mitigate power fluctuations and reduce mode crosstalk. Experimental results show significant improvements in received optical power and reduction in mode crosstalk using the proposed network under varying turbulence conditions.
Article
Optics
Guan Gui, Nathan J. Brooks, Henry C. Kapteyn, Margaret M. Murnane, Chen-Ting Liao
Summary: The study observes the second-harmonic spatiotemporal orbital angular momentum of an optical pulse and reveals the conservation of topological charge during frequency doubling. The experiment suggests a general nonlinear scaling rule for ST-OAM, analogous to conventional OAM of light, and demonstrates that the topology of a second-harmonic ST-OAM pulse can be modified by complex spatiotemporal astigmatism.
News Item
Optics
Philippe St-Jean
Summary: This paper presents a novel solid-state laser that can generate a large array of phase-locked optical vortices with tunable orbital angular momentum.
Article
Optics
Jinpeng Yuan, Xuewen Wang, Lirong Wang, Liantuan Xiao, Suotang Jia
Summary: In this study, we demonstrate the generation of high-order Bessel-like beam based on cross-phase modulation in nonlinear atomic media, and verify its self-healing ability and tunability. The novel beam is further applied in an obstruction-immune rotation sensor to measure the angular velocity, showing its potential in practical applications. Nonlinear atomic media serve as promising substitutes for spatial light modulators, offering vast prospects in modulating the light field structure.
News Item
Optics
Spencer W. Jolly
Summary: A diffractive axicon can create intricate connections between topological charges and frequencies of ultrashort laser pulses, resulting in a diverse range of coiled light structures.
Article
Optics
Tushar Sarkar, Reajmina Parvin, Maruthi M. Brundavanam, Rakesh Kumar Singh
Summary: In this Letter, a new, non-interferometric and highly stable technique is proposed and experimentally demonstrated to unscramble the incident orbital angular momentum (OAM) state and quantitatively measure the phase structure from non-imaged random light. A new theoretical basis is developed, validated by numerical simulation and experimental demonstration, to quantitatively investigate the OAM modes of the incident light.
Article
Physics, Applied
Zhiyuan Ye, Chenjie Zhou, Chen-Xin Ding, Jilun Zhao, Shuming Jiao, Hai-Bo Wang, Jun Xiong
Summary: In this paper, a nonlocal optical information-processing system called ghost diffractive deep neural networks (GD2NNs) is proposed, which combines traditional ghost diffraction with cascaded diffraction layers learned with use of diffractive deep neural networks. The system uses light's second-order coherence to enable image-free and interferometer-free coherent beam-demanded phase-object sorting with thermal light. Furthermore, GD2NNs convert the general encoder-decoder-detector cascaded framework into a parallel one, resulting in no optical interaction between the encoder and the decoder.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Yangyang Fu, Yuan Tian, Xiao Li, Shili Yang, Youwen Liu, Yadong Xu, Minghui Lu
Summary: In this study, a new method for achieving robust asymmetric generation of acoustic vortex field through dual-layer metasurfaces is introduced. This is achieved by controlling the intrinsic topologic charges and the parity of geometry design. The underlying physics is contributed to the one-way process of orbital angular momentum transition ensured by the broken spatial symmetry and the external topologic charge from the vortex diffraction. The novel phenomenon is experimentally demonstrated, providing new routes to manipulate the asymmetric response of vortex fields and potential applications in passive OAM-based diodes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Guo-Zhu Song, Jin-Liang Guo, Wei Nie, Leong-Chuan Kwek, Gui-Lu Long
Summary: We theoretically studied the optical properties of an ensemble of two-level atoms coupled to a one-dimensional waveguide, finding that the transport properties are affected by lattice constant and filling factor. Additionally, we observed initial bunching and quantum beats in the photon-photon correlation function of the transmitted field, which are significantly influenced by the filling factor of the lattice sites. Our results should be experimentally realizable in the near future with the advancement of interfacing quantum emitters with nanophotonics.
Article
Multidisciplinary Sciences
Yiyu Zhou, Boris Braverman, Alexander Fyffe, Runzhou Zhang, Jiapeng Zhao, Alan E. Willner, Zhimin Shi, Robert W. Boyd
Summary: The use of long multimode fibers for multiplexed quantum communication is hindered by modal crosstalk and polarization mixing. The authors demonstrate a vectorial time reversal technique to achieve high modal fidelity for a large number of spatial modes, using an auxiliary beam sent backward to pre-compensate for spatial distortions and polarization scrambling.
NATURE COMMUNICATIONS
(2021)
Article
Optics
S. A. Wadood, Kevin Liang, Yiyu Zhou, Jing Yang, M. A. Alonso, X-F Qian, T. Malhotra, S. M. Hashemi Rafsanjani, Andrew N. Jordan, Robert W. Boyd, A. Nick Vamivakas
Summary: The study investigates the effect of partial coherence on sub-diffraction limit localization of two sources based on parity sorting. Findings suggest that higher Fisher information can be obtained with prior information of a negative and real-valued degree of coherence, contributing to clarifying the role of coherence in quantum-limited metrology.
Article
Optics
Haoran Zhang, Zhen Sun, Ruoyang Qi, Liuguo Yin, Gui-Lu Long, Jianhua Lu
Summary: Rapid progress has been made in quantum secure direct communication in recent years. This paper reports a new design scheme that significantly improves the performance, such as reducing the quantum bit error rate and increasing the communication distance, thus increasing the secrecy capacity. The experimental results demonstrate the feasibility of using photonic time-bin and phase states in intercity quantum secure direct communication, based on current technology.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Ran-Ran Xie, Pengyu Wen, Hao Zhang, Yuechen Jia, Xue-Qing Cui, Min Wang, Gui-Qin Li, Guo-Qing Qin, Feng Chen, Gui-Lu Long
Summary: This research demonstrates the implementation of heterodyne amplification in Whispering-gallery-mode (WGM) microcavitics, which enhances the detection resolution and sensitivity by amplifying the backscattered light signal of perturbation targets through interference. The study highlights the significance of heterodyne interferometry in the development of optical microsensors.
Article
Optics
Kai Pang, Kaiheng Zou, Zhe Zhao, Hao Song, Yiyu Zhou, Maxim Karpov, Murat Yessenov, Abbas Shiri, Haoqian Song, Runzhou Zhang, Huibin Zhou, Xinzhou Su, Nanzhe Hu, Amir Minoofar, Tobias J. Kippenberg, Robert W. Boyd, Ayman F. Abouraddy, Moshe Tur, Alan E. Willner
Summary: In this study, we experimentally demonstrate the generation of a dynamic spatiotemporal structured beam that exhibits both rotation and revolution at a given propagation distance. By coherently combining nine Kerr frequency comb lines carrying designed superpositions of multiple Laguerre-Gaussian modes, we achieve a high mode purity in the generated beam. We also investigate the effects of the number of frequency comb lines and the revolving radius on the mode purity of the beam.
Article
Physics, Applied
Jiawei Wu, Gui-Lu Long, Masahito Hayashi
Summary: We study quantum secure direct communication using a general preshared quantum state and a generalization of dense coding. We propose a concrete protocol and derive an upper bound of information leakage.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Xuan Mao, Hong Yang, Dan Long, Min Wang, Peng-Yu Wen, Yun-Qi Hu, Bo-Yang Wang, Gui-Qin Li, Jian-Cun Gao, Gui-Lu Long
Summary: The mode-matching between conventional optical components and optical mode volumes is crucial for the efficiency of chip-based micro-devices. The Sagnac effect in a millimeter-scale wedged resonator gyroscope is observed and a bidirectional pump and probe scheme is demonstrated. The linear relationship between the detected beat frequency and the rotation velocity is established.
PHOTONICS RESEARCH
(2022)
Article
Optics
Pengyu Wen, Min Wang, Gui-Lu Long
Summary: In this paper, the authors propose a 1-dimensional optomechanical lattice with non-Hermitian property due to nonreciprocal couplings. They investigate the transmission property, directional amplification, and optomechanically induced transparency (OMIT) of the system using energy spectrum and Green function calculations. They also observe quantum interference and effective modulation of OMIT peak. This study is significant for non-Hermitian optical systems in the field of optics.
Article
Optics
Pengyu Wen, Xuan Mao, Min Wang, Chuan Wang, Gui-Qin Li, Gui-Lu Long
Summary: We propose a universal and scalable method to break the dark mode effect in optomechanical systems by introducing cross-Kerr nonlinearity. Multiple stable steady states can be achieved in our scheme, providing optimal parameters for cooling.
Article
Optics
Risheng Cheng, Yiyu Zhou, Sihao Wang, Mohan Shen, Towsif Taher, Hong X. Tang
Summary: Single-photon detectors play a crucial role in quantum information science and quantum sensing. However, few detectors have achieved high-fidelity photon number resolution at few-photon levels. In this study, we present an on-chip detector that can resolve up to 100 photons by spatiotemporally multiplexing an array of superconducting nanowires. Our detector enables unprecedented quantum photon statistics measurements and has potential applications in photonic quantum computation and quantum metrology.
Article
Physics, Applied
Yuntao Xu, Wei Fu, Yiyu Zhou, Mingrui Xu, Mohan Shen, Ayed Al Sayem, Hong X. Tang
Summary: Researchers experimentally studied the impact of superconductor absorption on microwave-to-optical conversion and provided a theoretical model to describe this effect. This study provides important insights for future designs of hybrid superconducting-photonic systems.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Guo-Qing Qin, Xuan Mao, Hao Zhang, Peng-Yu Wen, Gui-Qin Li, Dong Ruan, Gui-Lu Long
Summary: This paper presents a compensatory cooling mechanism for a Brillouin scattering optomechanical system with exceptional points (EPs). By manipulating the coupling strength of both the optical modes and the Brillouin phonon modes, the dual-EP system effectively compensates for the limited cooling process caused by defects in practical samples. This provides tools for manipulating optomechanical interactions in multimode systems and opens up possibilities for quantum state transfer and quantum interface protocols based on phonon cooling in quantum applications.
Article
Optics
Dan Long, Xuan Mao, Guo-Qing Qin, Hao Zhang, Min Wang, Gui-Qin Li, Gui-Lu Long
Summary: This study investigates the dynamic encircling of the exceptional point (EP) in a largely detuned multimode optomechanical system and explores the potential for state transfer and energy transfers between optical modes. The results demonstrate successful nonreciprocal and chiral topological energy transfers and discuss the evolution speed of system parameters.
Article
Optics
Xuan Mao, Guo-Qing Qin, Hong Yang, Zeguo Wang, Min Wang, Gui-Qin Li, Peng Xue, Gui-Lu Long
Summary: This study proposes a concise, continuously tunable, and all-optical partial polarization beam splitter (PBS), and demonstrates its applications in quantum walks and polarization modulation. Moreover, the optomechanically induced Faraday effect provides a new approach for controlling the polarization states in multimode resonators.