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Photonic orbital angular momentum with controllable orientation

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National Science Review 2022年第7期9卷 56-62页

作者： chenhao wan Jian Chen Andy Chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Department of Physics University of Dayton School of Optical and Electronic Information Huazhong University of Science and Technology Department of Electro-Optics and Photonics University of Dayton

Vortices are whirling disturbances,commonly found in nature,ranging from tremendously small scales in Bose-Einstein condensations to cosmologically colossal scales in spiral *** optical vortex,generally associated with a spiral phase,can carry orbital angular momentum(OAM).The optical OAM can either be in the longitudinal direction if the spiral phase twists in the spatial domain or in the transverse direction if the phase rotates in the spatiotemporal *** this article,we demonstrate the intersection of spatiotemporal vortices and spatial vortices in a wave *** a result of this intersection,the wave packet hosts a tilted OAM that provides an additional degree of freedom to the applications that harness the OAM of photons.

关键词： orbital angular momentum spatiotemporal vortex spatial vortex spiral phase

Detection of photonic orbital angular momentum with micro- and nano-optical structures

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Frontiers of Optoelectronics 2019年第1期12卷 88-96页

作者： chenhao wan Guanghao RUI Jian CHEN Qiwen ZHAN School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electro-Optics and Photonics University of Dayton300 College ParkDaytonOhio 45469USA Advanced Photonics Center Southeast UniversityNanjing 210096JiangsuChina School of Electronic Engineering University of Electronic Science and Technology of ChinaChengdu 611731China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Light with an optical orbital angular momentum(OAM)has attracted an increasing amount of interest and has found its way into many disciplines ranging from optical trapping,edge-enhanced microscopy,high-speed optical communication,and secure quantum teleportation to spin-orbital *** a variety of OAM-involved applications,it is crucial to discern different OAM states with high *** the current paper,we review the latest research progress on OAM detection with micro-and nano-optical structures that are based on plasmonics,photonic integrated circuits(PICs),and liquid crystal *** innovative OAM sorters are promising to ultimately achieve the miniaturization and integration of high-fidelity OAM detectors and inspire numerous applications that harness the intriguing properties of the twisted light.

关键词： orbital angular momentum (OAM) optical vortices singular optics spatial light modulator surface plasmon polariton (SPP) holography photonic integrated circuit (PIC)

Optical spatiotemporal vortices

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eLight 2023年第1期3卷 156-168页

作者： chenhao wan Andy Chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241South Korea Zhangjiang Laboratory 100 Haike RoadShanghai 201204China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

Spatiotemporal vortices of light,featuring transverse orbital angular momentum(OAM)and energy circulation in the spatiotemporal domain,have received increasing attention *** experimental realization of the controllable generation of spatiotemporal vortices triggers a series of research in this *** review article covers the latest developments of spatiotemporal vortices of light ranging from theoretical physics,experimental generation schemes,and characterization methods,to applications and future *** new degree of freedom in photonic OAM endowed by spatiotemporal vortices paves the way to the discovery of novel physical mechanisms and photonic applications in light science.

关键词： Spatiotemporal optical vortex Orbital angular momentum Spin-orbit interaction Linear momentum density Toroidal vortex Topological charge

Scalar optical hopfions

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eLight 2022年第1期2卷 284-290页

作者： chenhao wan Yijie Shen Andy Chong Qiwen Zhan School of Optical‑Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Department of Physics Pusan National UniversityGeumjeong‑GuBusan 46241South Korea Zhangjiang Laboratory 100 Haike RoadShanghai 201204China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

Hopfions are three-dimensional(3D)topological states discovered in field theory,magnetics,and hydrodynamics that resemble particle-like objects in physical *** inherit the topological features of the Hopf fibration,a homotopic mapping from unit sphere in 4D space to unit sphere in 3D *** we design and demonstrate dynamic scalar optical hopfions in the shape of a toroidal vortex and expressed as an approximate solution to Maxwell’s *** lines correspond to disjoint and interlinked loops forming complete ring tori in 3D *** Hopf invariant,product of two winding numbers,is determined by the topological charge of the poloidal spatiotemporal vortices and toroidal spatial vortices in toroidal *** hopfions provide a photonic testbed for studying topological states and may be utilized as high-dimensional information carriers.

关键词： Hopfion Toroidal vortex Spatiotemporal vortex Wave packet Topology Topological charge

Engineering photonic angular momentum with structured light:a review

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Advanced Photonics 2021年第6期3卷 8-22页

作者： Jian Chen chenhao wan Qiwen Zhan University of Shanghai for Science and Technology School of Optical-Electrical and Computer EngineeringShanghaiChina Huazhong University of Science and Technology School of Optical and Electronic InformationWuhanChina

Structured light with inhomogeneous phase,amplitude,and polarization spatial distributions that represent an infinite-dimensional space of eigenstates for light as the ideal carrier can provide a structured combination of photonic spin and orbital angular momentum(OAM).Photonic spin angular momentum(SAM)interactions with matter have long been studied,whereas the photonic OAM has only recently been discovered,receiving attention in the past three *** controlling polarization(i.e.,SAM)alone can provide useful information about the media with which the light interacts,light fields carrying both OAM and SAM may provide additional information,permitting new sensing mechanisms and light–matter *** summarize recent developments in controlling photonic angular momentum(AM)using complex structured optical *** oriented photonic SAM and OAM states may be generated through careful engineering of the spatial and temporal structures of optical ***,we discuss potential applications of specifically engineered photonic AM states in optical tweezers,directional coupling,and optical information transmission and processing.

关键词： photonic angular momentum spin angular momentum orbital angular momentum transverse spin transverse orbital angular momentum spatiotemporal optical vortex

Sculpturing spatiotemporal wavepackets with chirped pulses

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Photonics Research 2021年第11期9卷 2261-2264页

作者： QIAN CAO JIAN CHEN KEYIN LU chenhao wan ANDY CHONG QIWEN ZHAN School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Physics University of DaytonDaytonOhio 45469USA Department of Electro-Optics and Photonics University of DaytonDaytonOhio 45469USA

Pulse shaping has become a powerful tool in generating complicated ultrafast optical waveforms to meet specific application ***,pulse shaping focuses on the temporal waveform *** interests in structuring light in the spatiotemporal domain rely on Fourier analysis.A space-to-time mapping technique allows us to directly imprint complex spatiotemporal modulation through taking advantage of the relationship between frequency and time of chirped *** concept is experimentally verified through the generation of spatiotemporal optical vortex(STOV)and STOV *** power of this method is further demonstrated by STOV polarity reversal,vortex collision,and vortex *** a direct mapping technique opens tremendous potential opportunities for sculpturing complex spatiotemporal waveforms.

关键词： chirped vortex mapping

Generation of ultrafast spatiotemporal wave packet embedded with time-varying orbital angular momentum

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Science Bulletin 2020年第16期65卷 1334-1336,M0003页

作者： chenhao wan Jian Chen Andy Chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Physics University of DaytonDaytonOH 45469USA Department of Electro-Optics and Photonics University of DaytonDaytonOH 45469USA

It was not until 1992 did scientists realize that light beams with a helical phase carry orbital angular momentum(OAM)[1].The discovery of optical OAM has spurred a wealth of applications such as high-speed optical communications,optical spanners and spinorbit angular momentum coupling[2-4].To date,the majority of OAM beams are temporally static,i.e.,the OAM does not vary in ***,Rego et al.[5]generated extreme-ultraviolet selftorqued beams in high-harmonic generation driven by timedelayed pulses that differ by one unit of *** temporal OAM variation could potentially be utilized to manipulate nanostructures and launch chiral excitations on ultrafast time scales[6].

关键词：轨道角动量普朗克常数拓扑荷波包涡旋光束微纳米结构时间间隔相位旋转

Non-spreading Bessel spatiotemporal optical vortices

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Science Bulletin 2022年第2期67卷 133-140,M0003页

作者： Qian Cao Jian Chen Keyin Lu chenhao wan Andy Chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Physics University of DaytonDayton OH 45469USA Department of Electro-Optics and Photonics University of DaytonDayton OH 45469USA

Non-spreading nature of Bessel spatiotemporal wavepackets is theoretically and experimentally investigated and orders of magnitude improvement in the spatiotemporal spreading has been *** spatiotemporal confinement provided by the Bessel spatiotemporal wavepacket is further exploited to transport transverse orbital angular momentum through embedding spatiotemporal optical vortex into the Bessel spatiotemporal wavepacket, constructing a new type of wavepacket: Bessel spatiotemporal optical vortex. Both numerical and experimental results demonstrate that spatiotemporal vortex structure can be well maintained and confined through much longer propagation. High order spatiotemporal optical vortices can also be better confined in the spatiotemporal domain and prevented from further breaking up, overcoming a potential major obstacle for future applications of spatiotemporal vortex.

关键词： Optical vortices Bessel spatiotemporal wavepacket Orbital angular momentum Spatiotemporal vortex

Editorial of special issue on spatiotemporal optical fields and time-varying optical materials

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Chinese Optics Letters 2023年第12期21卷 1-6页

作者：万辰皓陈伟曹前 School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Optical science is currently witnessing a surge of interest in exploring complex optical fields with intricately tailored space-time *** spatiotemporal optical fields,carefully sculpted,are opening up new facets in both classical and quantum optics studies and paving the way for many novel *** include,but are not limited to,superresolution imaging,nanofabrication,optical manipulation,high-dimensional communication,and quantum information ***,there is a growing fascination surrounding time-varying optical *** dynamic materials,in stark contrast to their time-invariant counterparts,provide an innovative degree of freedom in orchestrating electromagnetic fields and light–matter interactions across time and ***,these time-varying materials offer a promising avenue for generating and tailoring spatiotemporal optical fields.

关键词： materials quantum invariant