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Ultrafast all-optical switching of dual-band plasmon-induced transparency in terahertz metamaterials

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Chinese Optics Letters 2022年第1期20卷 174-179页

作者： Hao Sun Jianghua Zhang Yuhua Tang Hengzhu Liu Jie Yang Xin Zheng College of Computer National University of Defense TechnologyChangsha 410073China National Innovation Institute of Defense Technology Beijing 100010China

An active ultrafast formation and modulation of dual-band plasmon-induced transparency(PIT) effect is theoretically and experimentally studied in a novel metaphotonic device operating in the terahertz regime,for the first time,to the best of our ***,we designed and fabricated a triatomic metamaterial hybridized with silicon islands following a newly proposed modulating *** this mechanism,a localized surface plasmon resonance is induced by the broken symmetry of a C_(2)structure,acting as the quasi-dark *** by exterior laser pumps,the photo-induced carriers in silicon promote the quasi-dark mode,which shields the near-field coupling between the dark mode and bright mode supported by the triatomic metamaterial,leading to the dynamical modulation of terahertz waves from individual-band into dual-band PIT effects,with a decay constant of 493 ***,a remarkable slow light effect occurs in the modulating process,accompanied by the dual-transparent *** dynamical switching technique of the dual-band PIT effect introduced in this work highlights the potential usefulness of this metaphotonic device in optical information processing and communication,including multi-frequency filtering,tunable sensors,and optical storage.

关键词： all-optical switching terahertz metamaterials dual-band plasmon-induced transparency ultrafast modulation

Nonlinear terahertz devices utilizing semiconducting plasmonic metamaterials

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Light(Science & Applications) 2016年第1期5卷 760-766页

作者： Huseyin R Seren Jingdi Zhang George R Keiser Scott J Maddox Xiaoguang Zhao Kebin Fan Seth R Bank Xin Zhang Richard D Averitt Laboratory for Microsystems Technology Department of Mechanical EngineeringBoston UniversityBostonMA 02215USA Department of Physics Boston UniversityBostonMA 02215USA Department of Physics UC San DiegoLa JollaCA 92093USA School of Engineering Brown UniversityProvidenceRI 02912USA Microelectronics Research Center The University of Texas at AustinAustinTX 78758USA

The development of responsive metamaterials has enabled the realization of compact tunable photonic devices capable of manipulating the amplitude,polarization,wave vector and frequency of *** of semiconductors into the active regions of metallic resonators is a proven approach for creating nonlinear metamaterials through optoelectronic control of the semiconductor carrier ***-free subwavelength resonant semiconductor structures offer an alternative approach to create dynamic *** present InAs plasmonic disk arrays as a viable resonant metamaterial at terahertz ***,InAs plasmonic disks exhibit a strong nonlinear response arising from electric field-induced intervalley scattering,resulting in a reduced carrier mobility thereby damping the plasmonic *** demonstrate nonlinear perfect absorbers configured as either optical limiters or saturable absorbers,including flexible nonlinear absorbers achieved by transferring the disks to polyimide *** plasmonic metamaterials show potential for use in ultrafast terahertz(THz)optics and for passive protection of sensitive electromagnetic devices.

关键词： nonlinear absorbers nonlinear metamaterials plasmonic semiconductor metamaterials terahertz metamaterials transfer printing

Design and theoretical study of a polarization-insensitive multiband terahertz metamaterial bandpass filter

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Chinese Physics B 2017年第12期26卷 576-580页

作者：李海鹏付文悦沈晓鹏韩奎王伟华 School of Physical Science and Technology China University of Mining and Technology Xuzhou 221116 China

We report the design of a novel multiband metamaterial bandpass filter （BPF） in the terahertz （THz）-wave region. The designed BPF is composed of a metal-dielectric-metal sandwiched structure with three nested rings on the top surface and a cross structure on the bottom surface. Full-wave simulation results show that the designed BPF has three transmission peaks at frequencies of 0.42, 1.27, and 1.86 THz with transmission rates of-0.87,-1.85, and-1.83 dB, respectively. Multi-reflection interference theory is introduced to explain the transmission mechanism of the designed triple-band BPF. The theoretical transmission spectrum is in good agreement with the full-wave simulated results. The designed BPF can maintain a stable performance as the incident angle varies from 0 to 30 for both transverse electric and transverse magnetic polarizations of the incident wave. The designed BPF can be potentially used in THz devices due to its multiband transmissions, polarization insensitivity, and stable wide-angle response in the THz region.

关键词： terahertz metamaterials bandpass filter full-wave simulation multi-reflection interference theory

Active formatting modulation of electromagnetically induced transparency in metamaterials

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Chinese Optics Letters 2020年第9期18卷 64-68页

作者： Hao Sun Yuhua Tang Yuze Hu Jie You Hengzhu Liu Xin Zheng College of Computer National University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China National Innovation Institute of Defense Technology Beijing 100010China

We experimentally demonstrate for the first time an active all-optical ultrafast modulation of electromagnetically induced transparency-like effect in a hybrid device of sapphire/Si/metamaterial. From numerical simulations, it can be deducted that the tuning process is attributed to the coupling between the dark mode existing in split-ring resonators and the bright mode existing in cut wire resonators. The transmission amplitude modulation is accompanied by the slow-light effect. In addition, the ultrafast formation process is measured to be as fast as 2 ps. This work should make an important contribution to novel chip-scale photonic devices and terahertz communications.

关键词： terahertz metamaterials ultrafast photoswitching electromagnetically induced transparency all-optical device