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Dynamic polarization rotation and vector field steering based on phase change metasurface

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Frontiers of physics 2023年第1期18卷 193-199页

作者： Hairong He Hui Yang Zhenwei Xie xiaocong yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical ***,conventional polarization devices are bulky,monofunctional and lack of tunability,which pose great challenges to the miniaturized and multifunctional ***,we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change *** supercell of the meta-device consists of four Ge2Sb2Te5(GST)elliptic cylinders located on a SiO2 *** independently controlling the phase state(amorphous or crystalline)of each GST elliptic cylinder,the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8°to 154.9°at a wavelength of 1550 ***,by merely altering the phase transition state of GST elliptic cylinders,we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums(OAMs)with topological charges of 0,1 and–1,*** proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

关键词： polarization rotation vector field steering phase change metasurface

On-chip plasmonic spin-Hall nanograting for simultaneously detecting phase and polarization singularities

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Light(Science & Applications) 2020年第1期9卷 1095-1103页

作者： Fu Feng Guangyuan Si Changjun Min xiaocong yuan Michael Somekh Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Melbourne Centre for Nanofabrication Victorian Node of the Australian National Fabrication FacilityClaytonVICAustralia Faculty of Engineering University of NottinghamNottingham NG72RDUK

Phase and polarization singularities are important degrees of freedom for electromagnetic field *** these singularities is essential for modern optics,but it is still a challenge,especially in integrated optical *** this paper,we propose an on-chip plasmonic spin-Hall nanograting structure that simultaneously detects both the polarization and phase singularities of the incident cylindrical vortex vector beam(CVVB).The nanograting is symmetry-breaking with different periods for the upper and lower parts,which enables the unidirectional excitation of the surface plasmon polariton depending on the topological charge of the incident optical vortex ***,spin-Hall meta-slits are integrated onto the grating so that the structure has a chiral response for polarization *** demonstrate theoretically and experimentally that the designed structure fully discriminates both the topological charges and polarization states of the incident beam *** proposed structure has great potential in compact integrated photonic circuits.

关键词： polarization simultaneous phase

Demonstration of orbital angular momentum channel healing using a Fabry‐Pérot cavity

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Opto-Electronic Advances 2018年第5期1卷 1-6页

作者： Shibiao Wei Dapeng Wang Jiao Lin xiaocong yuan Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information Technology Shenzhen University Shenzhen 518060 China School of Engineering RMIT University Melbourne VIC 3000 Australia

Orbital angular momentum （OAM） mode division provides a promising solution to push past the already exhausted available degrees of freedom available in conventional optical communications. Nevertheless, the practical deploymentof OAM within a free-space optical （FSO） communications system is still hampered by a major challenge, namely that OAM-based FSO links are vulnerable to disturbances. Though several techniques, such as using various non-diffraction beams and multiple transmit–receive apertures, are proposed to alleviate the influence of disturbances, these techniquessignificantly reduce the performance with regard to combating single fading for spatial blockages of the laser beam byobstructions. In this work, we initially demonstrate that a Fabry-Pérot resonant cavity has the ability to implement OAM mode healing, even for a blocking percentage of over 50%. Consequently, the proposed method will expand the use ofOAM in the FSO secure communications and quantum encryption fields.

关键词： optical communication orbital angular momentum Fabry-Pérot cavity

Cross-lenticular lens array for full parallax 3-D display with crosstalk reduction

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Science China(Technological Sciences) 2012年第3期55卷 735-742页

作者： XIE HongBin ZHAO Xing YANG Yong BU Jing FANG ZhiLiang yuan xiaocong Institute of Modern Optics Key Laboratory of Optoelectronic Information Science&TechnologyMinistry of Education of ChinaNankai UniversityTianjin 300071China

As a 3-D display technology,stereoscopic imaging with lenticular lens sheet can only offer viewers the horizontal *** reconstruct the 3-D image with parallax in both horizontal and vertical directions,the full parallax technique with micro-lens array was *** due to the fabrication constraints and cost concerns of the micro-lens array,application of the full parallax technique is restricted in *** this paper we revisited the lenticular sheet method and cross-lenticular lens array formed by two lenticular sheets overlapped *** analyzing the optical properties of this cross-lenticular lens array,we found that it has reasonable imaging qualities as a conventional micro-lens ***,due to the poor optical property of the outskirt area of the cross-lenticular lens,the cross-lenticular lens array has better crosstalk suppression capability than the conventional *** on the analysis,in this paper,we used the proposed lens array to reconstruct a 3-D image and verified its *** cross-lenticular lens array was found feasible to take the full parallax technique into commercial applications,with comparable advantages in terms of low-cost and easy fabrication over a large area.

关键词： 3-D display full parallax cross-lenticular lens array cross-talk

Microfabrication,surface modification,and laser guidance techniques to create a neuron biochip

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Optoelectronics Letters 2008年第5期4卷 387-390页

作者： Russell Kirk Pirlo Xiang Peng xiaocong yuan Bruce Zhi Gao Department of Bioengineering and Center for Optical Materials Science and Engineering Technologies Clemson University Clemson SC 29634 USA Institute of Optoelectronics Shenzhen University Shenzhen 518060 China School of Electrical ＆ Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798

In this report we illustrate our application of soft lithography-based microfabrication,surface modification,and our unique laser cell-patterning system toward the creation of neuron biochips. We deposited individual forebrain neurons from Day 7 embryonic chicks into two rows of eight in a silicon microstructure aligned over a microelectrode array (MEA). The polydimethylsiloxane (PDMS) membrane with microstructures to confine cells and guide network connectivity was aligned to the electrodes of a MEA. Both the MEA and the PDMS membrane were treated with O2 plasma,Poly-L-Lysine,and Laminin to aid in cell attachment and survival. The primary advantage of our process is that it is quicker and simpler than previous cell-placement methods and may make highly defined neuronal network biochips more practical.

关键词：表面处理技术激光器指导技术神经元生物芯片

Measuring the magnetic topological spin structure of light using an anapole probe

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Light(Science & Applications) 2022年第10期11卷 2503-2511页

作者： Fanfei Meng Aiping Yang Kang Du Fengyang Jia Xinrui Lei Ting Mei Luping Du xiaocong yuan Nanophotonics Research Centre Institute of Microscale OptoelectronicsShenzhen University518060 ShenzhenChina MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi'anChina

Topological spin structures of light,including the Skyrmion,Meron,and bi-Meron,are intriguing optical phenomena that arise from spin-orbit *** have promising potential applications in nano-metrology,data storage,super-resolved imaging and chiral *** from the electric part of optical spin,of equal importance is the magnetic part,particularly the H-type electromagnetic modes for which the spin topological properties of the field are dominated by the magnetic ***,their observation and measurement remains absent and faces difficult ***,we design a unique type of anapole probe to measure specifically the photonic spin structures dominated by magnetic *** probe is composed of an Ag-core and Si-shell nanosphere,which manifests as a pure magnetic dipole with no electric *** effectiveness of the method was validated by characterizing the magnetic field distributions of various focused vector *** was subsequently employed to measure the magnetic topological spin structures,including individual Skyrmions and Meron/Skyrmion lattices for the first *** proposed method may be a powerful tool to characterize the magnetic properties of optical spin and valuable in advancing spin photonics.

关键词： field. topological dipole

Plasmonic tweezers: for nanoscale optical trapping and beyond

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Light(Science & Applications) 2021年第4期10卷 475-515页

作者： Yuquan Zhang Changjun Min Xiujie Dou Xianyou Wang Hendrik Paul Urbach Michael G.Somekh xiaocong yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Optics Research Group Delft University of TechnologyLorentzweg 12628G DelftThe Netherlands

Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small *** recently,the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical *** use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength;with this confinement,the plasmonic field facilitates trapping of various nanostructures and materials with higher *** successful manipulation of small particles has fostered numerous and expanding *** this paper,we review the principles of and developments in plasmonic tweezers techniques,including both nanostructure-assisted platforms and structureless *** methods and evaluation criteria of the techniques are presented,aiming to provide a guide for the design and optimization of the *** most common novel applications of plasmonic tweezers,namely,sorting and transport,sensing and imaging,and especially those in a biological context,are critically ***,we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

关键词： trapping offering optical

Optical vortices 30 years on:OAM manipulation from topological charge to multiple singularities

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Light(Science & Applications) 2019年第1期8卷 339-367页

作者： Yijie Shen Xuejiao Wang Zhenwei Xie Changjun Min Xing Fu Qiang Liu Mali Gong xiaocong yuan Key Laboratory of Photonic Control Technology(Tsinghua University) Ministry of Education100084 BeijingChina State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina National Engineering Laboratory for Public Safety Risk Perception and Control by Big Data(NELPSRPC) China Academy of Electronics and Information Technology of CETCChina Electronic Technology Group Corporation100041 BeijingChina Nanophotonics Research Center Shenzhen University518060 ShenzhenChina

Thirty years ago,Coullet et *** that a special optical field exists in laser cavities bearing some analogy with the superfluid *** then,optical vortices have been widely studied,inspired by the hydrodynamics sharing similar *** to a fluid vortex with a central flow singularity,an optical vortex beam has a phase singularity with a certain topological charge,giving rise to a hollow intensity *** a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum *** amazing properties provide a new understanding of a wide range of optical and physical phenomena,including twisting photons,spin–orbital interactions,Bose-Einstein condensates,etc.,while the associated technologies for manipulating optical vortices have become increasingly tunable and ***,owing to these salient properties and optical manipulation technologies,tunable vortex beams have engendered tremendous advanced applications such as optical tweezers,high-order quantum entanglement,and nonlinear *** article reviews the recent progress in tunable vortex technologies along with their advanced applications.

关键词： tunable optics charge

Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control

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Light(Science & Applications) 2021年第12期10卷 2360-2368页

作者： Shuqing Chen Zhiqiang Xie Huapeng Ye Xinrou Wang Zhenghao Guo Yanliang He Ying Li xiaocong yuan Dianyuan Fan Institute of Microscale Optoelectronics Shenzhen University518060 ShenzhenChina Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouChina

The emergence of cylindrical vector beam(CVB)multiplexing has opened new avenues for high-capacity optical *** several configurations have been developed to couple/separate CVBs,the CVB multiplexer/demultiplexer remains elusive due to lack of effective off-axis polarization control *** we report a straightforward approach to realize off-axis polarization control for CVB multiplexing/demultiplexing based on a metal–dielectric–metal *** show that the left-and right-handed circularly polarized(LHCP/RHCP)components of CVBs are independently modulated via spin-to-orbit interactions by the properly designed metasurface,and then simultaneously multiplexed and demultiplexed due to the reversibility of light path and the conservation of vector *** also show that the proposed multiplexers/demultiplexers are broadband(from 1310 to 1625 nm)and compatible with *** a proof of concept,we successfully demonstrate a four-channel CVB multiplexing communication,combining wavelength-division-multiplexing and polarization-division-multiplexing with a transmission rate of 1.56 Tbit/s and a bit-error-rate of 10^(−6) at the receive power of−21.6 *** study paves the way for CVB multiplexing/demultiplexing and may benefit high-capacity CVB communication.

关键词： polarization beam properly