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Asymmetric frequency multiplexing topological devices based on a floating edge band

Photonics Research 2024年第6期12卷 1201-1212页

作者： JIAJUN MA chunmei ouyang YUTING YANG DONGYANG WANG HONGYI LI LI NIU YI LIU QUAN XU YANFENG LI ZHEN TIAN JIAGUANG HAN WEILI ZHANG Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering and Key Laboratory of Optoelectronics Information and TechnologyTianjin UniversityTianjin 300072China School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Topological photonics provides a platform for robust energy transport regardless of sharp corners and ***,the frequency multiplexing topological devices have attracted much attention due to the ability to separate optical signals by wavelength and hence the potential application in optical communication *** frequency multiplexing topological devices are generally based on the slow light ***,the resulting static local spatial mode or finely tuned flat band has zero-group velocity,making it difficult for both experimental excitation and channel ***,we propose and experimentally demonstrate an alternative prototype of asymmetric frequency multiplexing devices including a topological rainbow and frequency router based on floating topological edge mode(instead of localized ones);hence the multiple wavelength channels can be collectively excited with a point source and efficiently routed to separate output *** channel separation in our design is achieved by gradually tuning the band gap truncation on a topological edge band over a wide range of frequencies.A crucial feature lies in that the topological edge band is detached from bulk states and floating within the upper and lower photonic band *** interestingly,due to the sandwiched morphology of the edge band,the top and bottom band gaps will each truncate into transport channels that support topological propagation towards opposite directions,and the asymmetrical transportation is realized for the frequency multiplexing topological devices.

关键词： tuning floating hence

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Plasmon-induced transparency in terahertz metamaterials

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Science China(Information Sciences) 2013年第12期56卷 73-90页

作者： JING HuiHui ZHU ZhiHua ZHANG XueQian GU JianQiang TIAN Zhen ouyang chunmei HAN JiaGuang ZHANG WeiLi Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information Technology (Ministry of Education) School of Electrical and Computer Engineering Oklahoma State University

The quantum phenomena of electromagnetically induced transparency(EIT)or plasmonic analogue of electromagnetically induced transparency(PIT)can be mimicked in the classical resonators,leading to a unique way to explore the coherent coupling mechanism in metamaterial *** metamaterial structures have been proposed to excite and manipulate the PIT efect with flexibility and performance with geometry-controllable,polarization-independent,broadband-transparency and active-modulated *** in turn promise the fascinating functionalities and applications of the PIT efects,such as slow-light components,nonlinear devices and high-sensitivity ***,we present a review on the progress in developing the PIT efect in terahertz metamaterials over the past few years.

关键词： PIT terahertz metamaterial Q factor plasmon coupling

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Near-field manipulation of terahertz surface waves by metasurfaces [Invited]

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Chinese Optics Letters 2018年第5期16卷 2-6页

作者： Quan Xu Xueqian Zhang Yuehong Xu chunmei ouyang Yanfeng Li Jiaguang Han Weili Zhang Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Opto-electronics Information and Technical Science Ministry of Education Tianjin University Tianjin 300072 China School of Electrical and Computer Engineering Oklahoma State University Stillwater Oklahoma 71078 USA

Surface waves（SWs） are a special form of electromagnetic waves that travel along the boundary between a metal and a dielectric. The special optical properties of SWs render them very attractive in applications, such as subdiffractional lithography, novel biochemical sensors, and ultrafast integrated circuitries. Herein, we present a review of our recent progress in excitation and manipulation of terahertz SWs due to interference or coupling between a pair of slit resonators in metasurfaces, showing the ability to devise ultrathin and compact plasmonic components.

关键词： SW Near-field manipulation of terahertz surface waves by metasurfaces

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Recent progress in graphene terahertz modulators

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Chinese Physics B 2020年第7期29卷 111-119页

作者： Xieyu Chen Zhen Tian Quan Li Shaoxian Li Xueqian Zhang chunmei ouyang Jianqiang Gu Jiaguang Han Weili Zhang Center for Terahertz Waves and School of Precision Instrument and Optoelectronics Engineering and the Key Laboratory of Optoelectronics Information and Technology(Ministry of Education)Tianjin UniversityTianjin 300072China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Graphene has been recognized as a promising candidate in developing tunable terahertz(THz)functional devices due to its excellent optical and electronic properties,such as high carrier mobility and tunable ***,we review graphene-based THz modulators we have recently ***,the optical properties of graphene are ***,graphene THz modulators realized by different methods,such as gate voltage,optical pump,and nonlinear response of graphene are ***,challenges and prospective of graphene THz modulators are also discussed.

关键词： terahertz graphene modulators

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Terahertz surface plasmonic waves: a review

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Advanced Photonics 2020年第1期2卷 2-20页

作者： Xueqian Zhang Quan Xu Lingbo Xia Yanfeng Li Jianqiang Gu Zhen Tian chunmei ouyang Jiaguang Han Weili Zhang Tianjin University and the Key Laboratory of Optoelectronics Information and Technology(Ministry of Education) Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringTianjinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Terahertz science and technology promise many cutting-edge *** surface plasmonic waves that propagate at metal–dielectric interfaces deliver a potentially effective way to realize integrated terahertz devices and *** concerns regarding terahertz surface plasmonic waves have been based on their highly delocalized ***,recent advances in plasmonics indicate that the confinement of terahertz surface plasmonic waves,as well as their propagating behaviors,can be engineered by designing the surface environments,shapes,structures,materials,etc.,enabling a unique and fascinating regime of plasmonic *** with the essential spectral property of terahertz radiation,as well as the increasingly developed materials,microfabrication,and time-domain spectroscopy technologies,devices and systems based on terahertz surface plasmonic waves may pave the way toward highly integrated platforms for multifunctional operation,implementation,and processing of terahertz waves in both fundamental science and practical *** present a review on terahertz surface plasmonic waves on various types of supports in a sequence of properties,excitation and detection,and *** current research trend and outlook of possible research directions for terahertz surface plasmonic waves are also outlined.

关键词： plasmonics surface waves terahertz

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Moiré-driven electromagnetic responses and magic angles in a sandwiched hyperbolic metasurface

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Photonics Research 2022年第9期10卷 2056-2065页

作者： YI LIU chunmei ouyang QUAN XU XIAOQIANG SU QUANLONG YANG JIAJUN MA YANFENG LI ZHEN TIAN JIANQIANG GU LIYUAN LIU JIAGUANG HAN YUNLONG SHI WEILI ZHANG Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology(Ministry of Education of China)Tianjin UniversityTianjin 300072China Institute of Solid State Physics College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsShanxi Datong UniversityDatong 037009China Nonlinear Physics Centre Australian National UniversityCanberraACT 2601Australia School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Recent moiréconfigurations provide a new platform for tunable and sensitive photonic responses,as their enhanced light–matter interactions originate from the relative displacement or rotation angle in a stacking bilayer or multilayer periodic ***,previous findings are mostly focused on atomically thin condensed matter,with limitations on the fabrication of multilayer structures and the control of rotation *** microwave moiréconfigurations are still difficult to ***,we design a novel moiréstructure,which presents unprecedented capability in the manipulation of light–matter *** on the effective medium theory and S-parameter retrieval process,the rotation matrix is introduced into the dispersion relation to analyze the underlying physical mechanism,where the permittivity tensor transforms from a diagonal matrix to a fully populated one,whereas the permeability tensor evolves from a unit matrix to a diagonal one and finally becomes fully filled,so that the electromagnetic responses change drastically as a result of stacking and ***,the experiment and simulation results reveal hybridization of eigenmodes,drastic manipulation of surface states,and magic angle properties by controlling the mutual rotation angles between two isolated ***,not only a more precisely controllable bilayer hyperbolic metasurface is introduced to moiréphysics,the findings also open up a new avenue to realize flat bands at arbitrary frequencies,which shows great potential in active engineering of surface waves and designing multifunctional plasmonic devices.

关键词： rotation hyperbolic diagonal

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用于空间通信的小型化高功率低噪声光纤放大器

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光子学报 2022年第4期51卷 40-48页

作者：陈文韬徐剑秋欧阳春梅天津大学精密仪器与光电子工程学院天津300072 苏州市激光智能制造技术研究所江苏苏州215000

针对空间应用设计了结构紧凑、高功率、低功耗的光纤放大器。在电学设计上,以数字信号处理芯片为核心处理器设计了泵浦源驱动控制系统,形成了输出-检测-再输出的闭环控制逻辑,通过自动功率控制保证输出稳定性,同时降低泵浦源功耗,提升... 详细信息

针对空间应用设计了结构紧凑、高功率、低功耗的光纤放大器。在电学设计上,以数字信号处理芯片为核心处理器设计了泵浦源驱动控制系统,形成了输出-检测-再输出的闭环控制逻辑,通过自动功率控制保证输出稳定性,同时降低泵浦源功耗,提升电光效率。在机械设计上采用光电分离模块化设计,不仅有利于散热和保持紧凑的结构,而且实现光学部分与电学部分互不干扰,并维持整体重量低于1 kg。在光学结构上使用两级放大设计,信号光通过掺铒光纤与铒镱共掺光纤两级放大光路。实验研究了不同泵浦功率、不同光纤长度下放大器的转换效率、功耗以及光谱特性,最终实现了对1551 nm毫瓦级种子光放大至7.39 W的保偏信号输出,信噪比保持在40 dB,整体功耗不超过80 W,适用于空间通信。

关键词：空间通信光纤放大器数值仿真自动功率控制掺铒光纤铒镱共掺光纤

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全负色散的单根全固型掺镱光子带隙光纤飞秒孤子激光器

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中国激光 2008年第10期35卷 1445-1448页

作者：欧阳春梅柴路(指导) 胡明列宋有建王清月天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室天津300072

设计了一种采用半导体可饱和吸收镜(SESAM)实现被动锁模的激光器,该激光器中只有单根的全固型掺镱光子带隙光纤(AS-Yb-PBGF)。在1μm波段,该光纤具有负的群速度色散(GVD),因此腔内激光增益和负的GVD同时由该光纤提供。激光腔内非线性效... 详细信息

设计了一种采用半导体可饱和吸收镜(SESAM)实现被动锁模的激光器,该激光器中只有单根的全固型掺镱光子带隙光纤(AS-Yb-PBGF)。在1μm波段,该光纤具有负的群速度色散(GVD),因此腔内激光增益和负的GVD同时由该光纤提供。激光腔内非线性效应与仅由AS-Yb-PBGF提供的负GVD平衡作用可使激光器实现孤子运转。用分步傅里叶方法数值模拟了其孤子运转的动力学过程,该系统中初始的噪声信号经过数百次循环就可以得到稳定的孤子运转。输出脉冲能量为135 pJ,脉冲宽度为125 fs,时间带宽乘积为0.33,接近傅里叶变换极限的脉冲,脉冲重复频率可达500 MHz。系统地研究了整个激光器中孤子脉冲演变的动力学过程。

关键词：激光技术孤子光纤激光器全固型光子带隙光纤半导体可饱和吸收镜分步傅里叶方法

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Anisotropic coding metamaterials and their powerful manipulation of differently polarized terahertz waves

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Light(Science & Applications) 2016年第1期5卷 767-777页

作者： Shuo Liu Tie Jun Cui Quan Xu Di Bao Liangliang Du Xiang Wan Wen Xuan Tang chunmei ouyang Xiao Yang Zhou Hao Yuan Hui Feng Ma Wei Xiang Jiang Jiaguang Han Weili Zhang Qiang Cheng State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Synergetic Innovation Center of Wireless Communication Technology Southeast UniversityNanjing 210096China Cooperative Innovation Centre of Terahertz Science Chengdu 610054China Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072China Jiangsu Xuantu Technology Co. Ltd.Nanjing 211111China

Metamaterials based on effective media can be used to produce a number of unusual physical properties(for example,negative refraction and invisibility cloaking)because they can be tailored with effective medium parameters that do not occur in ***,the use of coding metamaterials has been suggested for the control of electromagnetic waves through the design of coding sequences using digital elements‘0’and‘1,'which possess opposite phase *** we propose the concept of an anisotropic coding metamaterial in which the coding behaviors in different directions are dependent on the polarization status of the electromagnetic *** experimentally demonstrate an ultrathin and flexible polarization-controlled anisotropic coding metasurface that functions in the terahertz regime using specially designed coding *** encoding the elements with elaborately designed coding sequences(both 1-bit and 2-bit sequences),the x-and y-polarized waves can be anomalously reflected or independently diffused in three *** simulated far-field scattering patterns and near-field distributions are presented to illustrate the dual-functional performance of the encoded metasurface,and the results are consistent with the measured *** further demonstrate the ability of the anisotropic coding metasurfaces to generate a beam splitter and realize simultaneous anomalous reflections and polarization conversions,thus providing powerful control of differently polarized electromagnetic *** proposed method enables versatile beam behaviors under orthogonal polarizations using a single metasurface and has the potential for use in the development of interesting terahertz devices.

关键词： anisotropic metamaterial design coding metamaterial metasurface terahertz waves

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基于全固型掺镱光子带隙光纤的被动锁模全光纤环形孤子激光器

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中国激光 2008年第5期35卷 647-650页

作者：欧阳春梅柴路宋有建胡明列王清月天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室天津300072

采用全固型掺镱光子带隙光纤(AS-Yb-PBGF)作增益介质并提供反常群速色散(GVD),设计了一种被动锁模全光纤环形孤子激光器。没有使用任何块状色散补偿元件。因此,该激光器腔型结构简单、紧凑、环境稳定性高,更容易实现全光纤结构。脉冲在... 详细信息

采用全固型掺镱光子带隙光纤(AS-Yb-PBGF)作增益介质并提供反常群速色散(GVD),设计了一种被动锁模全光纤环形孤子激光器。没有使用任何块状色散补偿元件。因此,该激光器腔型结构简单、紧凑、环境稳定性高,更容易实现全光纤结构。脉冲在激光腔内的传输用广义非线性薛定谔方程描述,并采用分步傅里叶方法数值模拟了该激光器的单孤子运转的动力学过程。计算时,将AS-Yb-PBGF的长度选取为0.4m,改变激光腔内单模光纤(SMF)的长度,得出了最佳运转参数:当AS-Yb-PBGF固定为0.4 m时,选择单模光纤等于0.4 m,就可以实现脉冲宽度为244 fs,脉冲能量为14 pJ和时间带宽乘积为0.32,即接近傅里叶变换极限的单孤子运转。

关键词：激光器孤子光纤激光器分步傅里叶方法全固型光子带隙光纤

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