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High-order nonreciprocal add-drop filter

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 121-129页

作者： Hang Li Rui Ge YuChen Peng Bei Yan JianLan Xie JianJun Liu shuangchun wen Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Topological photonics have led to robust optical behavior of optical devices, which has alleviated the influence of manufacturing defects and perturbations on the device performance. Meanwhile, temporal coupled-mode theory(t-CMT) has been developed and applied widely. However, the t-CMT of cascaded coupled cavities(CCC) system and its corresponding high-order filter has yet to be established. Here, the t-CMT of CCC system is established based on the existing t-CMT. By combining the CCC with topological waveguides, a versatile design scheme of high-order nonreciprocal add-drop filter(HONAF) is proposed. The relationship between the coupling effect of cavities and transmission and the filtering performance of HONAF is analyzed quantitatively. Then, a method to improve the transmission efficiency and quality factor of the filter is given. The proposed HONAF is based on the combination of gyromagnetic photonic crystals and decagonal Penrose-type photonic quasicrystals. The transmission and filtering performance of the HONAF are numerically analyzed, which verifies the consistency between theoretical prediction and numerical simulation. The established t-CMT of CCC system can be widely used in coupled resonator optical waveguides and their related systems. The proposed HONAF with excellent performance can also be applied to wavelength division multiplexing/demultiplexing systems.

关键词： filter photonic crystals photonic quasicrystals temporal coupled-mode theory

Photonic Hall effect and helical Zitterbewegung in a synthetic Weyl system

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Light(Science & Applications) 2019年第1期8卷 758-765页

作者： Weimin Ye Yachao Liu Jianlong Liu Simon A.R.Horsley shuangchun wen Shuang Zhang College of Advanced Interdisciplinary Studies National University of Defense Technology410073 ChangshaChina Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan University410082 ChangshaChina School of Physics&Astronomy University of BirminghamBirmingham B152TTUK Department of Physics Harbin Institute of Technology150001 HarbinChina Department of Physics and Astronomy University of ExeterExeter EX44QLUK

Systems supporting Weyl points have gained increasing attention in condensed physics,photonics and acoustics due to their rich physics,such as Fermi arcs and chiral *** as sources or drains of Berry curvature,Weyl points exhibit a singularity of the Berry curvature at their *** is,therefore,expected that the induced effect of the Berry curvature can be dramatically enhanced in systems supporting Weyl *** this work,we construct synthetic Weyl points in a photonic crystal that consists of a honeycomb array of coupled rods with slowly varying radii along the direction of *** system possesses photonic Weyl points in the synthetic space of two momenta plus an additional physical parameter with an enhanced Hall effect resulting from the large Berry curvature in the vicinity of the Weyl ***,a helical Zitterbewegung(ZB)is observed when the wave packet traverses very close to a Weyl point,which is attributed to the contribution of the non-Abelian Berry connection arising from the near degenerate eigenstates.

关键词： curvature Berry helical

A terawatt Nd:glass chirped pulse amplification laser system seeded by two order optical parametric amplification

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 776-780页

作者： ZHANG LiFu FU XiQuan DENG JianQin ZHANG Jin wen shuangchun FAN DianYuan Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education and College of Information Science and Engineering Hunan University Changsha 410082 China College of Electrical Engineering Anhui Polytechnic University Wuhu 241000 China

We present the performance of a high-power Nd:glass laser system,which produces a 1.1 J,250 fs,7.3 nm broadband laser pulse based on the combination of optical parametric amplification(OPA) and chirped pulse amplification(CPA).The two-stage OPA provides broadband seed pulses for the three-stage Nd:glass amplifiers based on the technology of *** to the conventional oscillator seed source,the most important advantage of such a seed source supplied by the two-stage OPA is that it possesses the capacities of broad bandwidth and high energy.

关键词： broadband laser pulse optical parametric amplification (OPA) chirped pulse amplification (CPA)

Generation of arbitrary vector vortex beams on hybrid-order Poincaré sphere

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Photonics Research 2017年第1期5卷 15-21页

作者： Zhenxing Liu Yuanyuan Liu Yougang Ke Yachao Liu Weixing Shu Hailu Luo shuangchun wen Laboratory for Spin Photonics School of Physics and Electronics Hunan University

We propose theoretically and verify experimentally a method of combining a q-plate and a spiral phase plate to generate arbitrary vector vortex beams on a hybrid-order Poincaré sphere. We demonstrate that a vector vortex beam can be decomposed into a vector beam and a vortex, whereby the generation can be realized by sequentially using a q-plate and a spiral phase plate. The generated vector beam, vortex, and vector vortex beam are verified and show good agreement with the prediction. Another advantage that should be pointed out is that the spiral phase plate and q-plate are both fabricated on silica substrates, suggesting the potential possibility to integrate the two structures on a single plate. Based on a compact method of transmissive-type transformation, our scheme may have potential applications in future integrated optical devices.

关键词： Generation of arbitrary vector vortex beams on hybrid-order Poincar sphere

Broadband Pulsed Fiber Laser Generation with Topological Insulator: Towards the Mid-Infrared Regime

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Journal of Electronic Science and Technology 2015年第4期13卷 298-304页

作者： Guobao Jiang Lili Miao Yu Chen Shunbin Lu Shuqing Chen Chujun Zhao Han Zhang shuangchun wen the Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education School of Physics and Electronics Hunan University the Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education School of Physics and Electronics Hunan University SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University

In recent years, topological insulators have aroused the attention of a great number of scientists due to their unique electronic structures and peculiar physical properties. Triggered by the similar electronic structures as graphene, the broadband nonlinear absorption properties of topological insulator were investigated. Moreover, the mode-locked or Q-switched fiber lasers based on topological insulator were realized for broadband operating wavelength. Here, we present an overview of the preparation, transferring, linear and nonlinear optical properties and their applications of topological insulators in pulsed fiber lasers. The pulsed fiber lasers towards mid- infrared regimes have been proposed.

关键词： Mode-locking Q-switching saturableabsorption topological insulator.

Giant photonic spin Hall effect in momentum space in a structured metamaterial with spatially varying birefringence

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Light(Science & Applications) 2015年第1期4卷 354-359页

作者： Xiaohui Ling Xinxing Zhou Xunong Yi Weixing Shu Yachao Liu Shizhen Chen Hailu Luo shuangchun wen Dianyuan Fan Laboratory for Spin Photonics School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Physics and Electronic Information Science Hengyang Normal UniversityHengyang 421002China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China

The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit ***,we report the observation of a giant photonic SHE in a dielectric-based *** metamaterial is structured to create a coordinate-dependent,geometric Pancharatnam–Berry phase that results in an SHE with a spin-dependent splitting in momentum *** is unlike the SHE that occurs in real space in the reflection and refraction at an interface,which results from the momentum-dependent gradient of the geometric Rytov–Vladimirskii–Berry *** theorize a unified description of the photonic SHE based on the two types of geometric phase gradient,and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible *** results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics.

关键词： geometric phase metamaterial photonic spin Hall effect

Two-dimensional optical spatial differentiation and high-contrast imaging

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National Science Review 2021年第6期8卷 180-187页

作者： Junxiao Zhou Haoliang Qian Junxiang Zhao Min Tang Qianyi Wu Ming Lei Hailu Luo shuangchun wen Shaochen Chen Zhaowei Liu Key Laboratory for Micro-/NanoOptoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan University Department of Electrical and Computer Engineering University of California Department of Nano Engineering University of California Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Science and Technology Innovation CenterZhejiang University

Optical analog signal processing technology has been widely studied and applied in a variety of science and engineering fields, with the advantages of overcoming the low-speed and high-power consumption associated with its digital counterparts. Much attention has been given to emerging metasurface technology in the field of optical imaging and processing systems. Here, we demonstrate, for the first time, broadband two-dimensional spatial differentiation and high-contrast edge imaging based on a dielectric metasurface across the whole visible spectrum. This edge detection method works for both intensity and phase objects simply by inserting the metasurface into a commercial optical microscope. This highly efficient metasurface performing a basic optical differentiation operation opens up new opportunities in applications of fast,compactible and power-efficient ultrathin devices for data processing and biological imaging.

关键词： metasurface edge detection spatial differentiation

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超常介质中超短电磁脉冲的传输特性研究

光学学报 2007年第8期27卷 1475-1480页

作者：卓辉文双春湖南大学计算机与通信学院长沙410082

将超常介质的色散磁导率合并到非线性极化项中,借鉴常规介质中超短脉冲传输方程的推导方法,得到了非线性超常介质中超短脉冲的传输方程。在德鲁德(Drude)色散模型下,根据脉冲中心频率的不同在传输方程中出现了可正、可负、可为零的自陡... 详细信息

将超常介质的色散磁导率合并到非线性极化项中,借鉴常规介质中超短脉冲传输方程的推导方法,得到了非线性超常介质中超短脉冲的传输方程。在德鲁德(Drude)色散模型下,根据脉冲中心频率的不同在传输方程中出现了可正、可负、可为零的自陡峭系数,以及高阶非线性色散项。此外,利用矩方法对传输方程进行分析,得到了超常介质中超短脉冲传输方程的能量守恒定律表达式,揭示了色散磁导率导致的超短脉冲传输的新特性,发现二阶非线性色散使超短脉冲的能量、脉冲频移、脉冲宽度、中心位置和啁啾都随传输距离呈现振荡式变化。

关键词：非线性光学超常介质超短脉冲传输

All-optical object identification and threedimensional reconstruction based on optical computing metasurface

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Opto-Electronic Advances 2023年第12期6卷 5-14页

作者： Dingyu Xu wenhao Xu Qiang Yang wenshuai Zhang shuangchun wen Hailu Luo Laboratory for Spin Photonics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China.

Object identification and three-dimensional reconstruction techniques are always attractive research interests in machine vision,virtual reality,augmented reality,and biomedical *** computing metasurface,as a two-dimensional artificial design component,has displayed the supernormal character of controlling phase,amplitude,polarization,and frequency distributions of the light beam,capable of performing mathematical operations on the input light ***,we propose and demonstrate an all-optical object identification technique based on optical computing metasurface,and apply it to 3D *** traditional mechanisms,this scheme reduces memory consumption in the processing of the contour surface *** identification and reconstruction of experimental results from high-contrast and low-contrast objects agree well with the real *** exploration of the all-optical object identification and 3D reconstruction techniques provides potential applications of high efficiencies,low consumption,and compact systems.

关键词： object identification three-dimensional reconstruction optical computing metasurface