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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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On-chip terahertz orbital angular momentum demultiplexer

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Photonics Research 2024年第5期12卷 1044-1054页

作者： XIAOhan JIANG WANYING LIU QUAN XU YUANHAO LANG YIKAI FU FAN HUANG HAITAO DAI YANFENG LI XUEQIAN ZhanG JIANQIANG GU jiaguang han WEILI ZhanG Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineeringand Key Laboratory of Optoelectronics Information and Technology(Ministry of Education)Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China 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

The terahertz regime is widely recognized as a fundamental domain with significant potential to address the demands of next-generation wireless *** parallel,mode division multiplexing based on orbital angular momentum(OAM)shows promise in enhancing bandwidth utilization,thereby expanding the overall communication channel *** this study,we present both theoretical and experimental demonstrations of an on-chip terahertz OAM *** device effectively couples and steers seven incident terahertz vortex beams into distinct high-quality focusing surface plasmonic beams,and the focusing directions can be arbitrarily *** proposed design strategy integrates space-to-chip mode conversion,OAM recognition,and on-chip routing in a compact space with subwavelength thickness,exhibiting versatility and superior performance.

关键词： demultiplexer momentum angular

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Optical cavity resonance with magnetized plasma

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Chinese Optics Letters 2018年第5期16卷 17-20页

作者： Dongyang Wang jiaguang han Shuang Zhang School of Physics ＆ Astronomy University of Birmingham Birmingham B15 2TT UK Center for Terahertz Waves and College of Precision Instrument and Optoeleetronics Engineering Tianjin University Tianjin 300072 China

Indefinite media with mixed signs of dielectric tensor elements possess unbounded equifrequency surfaces that have been utilized for diverse applications such as superimaging, enhanced spontaneous emission, and thermal radiation. One particularly interesting application of indefinite media is an optical cavity supporting anomalous scaling laws. In this Letter, we show that by replacing an indefinite medium with magnetized plasma one can construct a tunable indefinite cavity. The magnetized plasma model is based on realistic semiconductor material properties at terahertz frequencies that show hyperbolic dispersion in a certain frequency regime. The hyperbolic dispersion features are utilized for the design of optical cavities. Dramatically different sizes of cavities can support the same resonance mode at the same frequency. For a cavity of fixed size, the anomalous scaling law between the resonance frequency and mode number is confirmed. The resonance frequency can be strongly modulated by changing the strength of the applied magnetic field. The proposed model provides active controllability of terahertz resonances on the deep subwavelength scale with realistic semiconductor materials.

关键词： Optical cavity resonance with magnetized plasma

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Terahertz spectral properties of melamine and its deuterated isotope,melamine-d_6

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Nuclear Science and Techniques 2012年第4期23卷 209-214页

作者： HE Mingxia LI Meng TIAN Zhen CAO Wei han jiaguang Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

The far-infrared optical properties of melamine and its deuterated isotope,melamine-d_6 were experimentally and theoretically investigated in the frequency range from 0.2 to 3.0 *** the room temperature and dry air nitrogen conditions,three absorption bands were observed at 2.0,2.3 and 2.6 THz in the melamine sample by use of terahertz time-domain ***,in the melamine-d_6 sample,the observed absorption bands shift towards lower frequencies and the relative intensity of the absorption bands *** simulation results based on the Parameterized Model number 3(PM3) were compared with the experimental data and the observed vibration spectra were assigned according to the PM3 *** absorption bands of the measured melamine samples at terahertz frequencies are highly correlated with the intermolecular hydrogen bond stretching and π-π stacking ***,the red shift of the absorption bands is due to hydrogen/deuterium substitution.

关键词：太赫兹时域光谱三聚氰胺氘同位素光谱特性分子间氢键频率范围实验数据吸收带

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All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting

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Light(Science & Applications) 2018年第1期7卷 766-774页

作者： Longqing Cong Yogesh Kumar Srivastava Huifang Zhang Xueqian Zhang jiaguang han Ranjan Singh Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information TechnologyMinistry of EducationTianjin University300072 TianjinPeople’s Republic of China

Miniaturized ultrafast switchable optical components with an extremely compact size and a high-speed response will be the core of next-generation all-optical devices instead of traditional integrated circuits,which are approaching the bottleneck of Moore’s *** have emerged as fascinating subwavelength flat optical components and devices for light focusing and holography ***,these devices exhibit a severe limitation due to their natural passive *** we introduce an active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz *** modulation of polarization states and the beam splitting ratio are experimentally demonstrated on a time scale of 667 *** scheme of hybrid metasurfaces could also be extended to the design of various free-space all-optical active devices,such as varifocal planar lenses,switchable vector beam generators,and components for holography in ultrafast imaging,display,and high-fidelity terahertz wireless communication systems.

关键词： polarization optical beam

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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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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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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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Broadband terahertz wave generation from an epsilon-near-zero material

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Light(Science & Applications) 2021年第1期10卷 115-122页

作者： Wenhe Jia Meng Liu Yongchang Lu Xi Feng Qingwei Wang Xueqian Zhang Yibo Ni Futai Hu Mali Gong Xinlong Xu Yuanyuan Huang Weili Zhang Yuanmu Yang jiaguang han State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Center for THz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072China Shaanxi Joint Lab of Graphene International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics and Photon-TechnologyNorthwest UniversityXi'an 710069China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and ***,THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness,with the bandwidth limited by the phase-matching *** we demonstrate broadband THz emission via surface optical rectification from a simple,commercially available 19nmthick indium tin oxide(ITO)thin *** show an enhancement of the generated THz signal when the pump laser is tuned around the epsilon-near-zero(ENZ)region of ITO due to the pump laser field enhancement associated with the ENZ *** bandwidth of the THz signal generated from the ITO film can be over 3 THz,unrestricted by the phasematching *** work offers a new possibility for broadband THz generation in a subwavelength thin film made of an ENZ material,with emerging physics not found in existing nonlinear crystals.

关键词： pump film matching

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Tailoring electromagnetic responses in terahertz superconducting metamaterials

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Frontiers of Optoelectronics 2015年第1期8卷 44-56页

作者： Xiaoling ZhanG Jianqiang GU jiaguang han Weili ZhanG Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China

Superconducting terahertz metamaterials have attracted significant interest due to low loss, efficient resonance switching and large-range frequency tunability. The super conductivity in the metamaterials dramatically reduces ohmic loss and absorption to levels suitable for novel devices over a broad range of electromagnetic spectrum. Most metamaterials utilize subwavelength-scale split-ring resonators as unit building blocks, which are proved to support fundamental inductive-capacitive reso- nance, to achieve unique resonance performance. We presented a review of terahertz superconducting metama- terials and their implementation in multifunctional devices. We began with the recent development of superconducting metamaterials and their potential applications in control- ling and manipulating terahertz waves. Then we explored the tuning behaviors of resonance properties in several typical, actively controllable metamaterials through integrating active components. Finally, the ultrafast dynamic nonlinear response to high intensity terahertz field in the superconducting metamaterials was presented.

关键词： superconducting metamaterial terahertz,active metamaterial

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