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Infrared and Terahertz Photonics
Ultrafast all-optical switching of dual-band plasmon-induced transparency in terahertz metamaterials
Download:514次
Hao Sun
1
Jianghua Zhang
2
Yuhua Tang
1
Hengzhu Liu
1
[ ... ]
Xin Zheng
2,*
Author Affiliations
Abstract
1
College of Computer, National University of Defense Technology, Changsha 410073, China
2
National Innovation Institute of Defense Technology, Beijing 100010, China
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 knowledge. Specifically, we designed and fabricated a triatomic metamaterial hybridized with silicon islands following a newly proposed modulating mechanism. In this mechanism, a localized surface plasmon resonance is induced by the broken symmetry of a
C
2
structure, acting as the quasi-dark mode. Excited 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 ps. Moreover, a remarkable slow light effect occurs in the modulating process, accompanied by the dual-transparent windows. The 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.
all-optical switching
terahertz metamaterials
dual-band plasmon-induced transparency
ultrafast modulation
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Chinese Optics Letters
2022, 20(1): 013701
Nanophotonics, Metamaterials, and Plasmonics
Process-controllable modulation of plasmon-induced transparency in terahertz metamaterials
Download:831次
Hao Sun
1
Jie Yang
2
Hengzhu Liu
1
Dan Wu
3
Xin Zheng
2,*
Author Affiliations
Abstract
1
College of Computer, National University of Defense Technology, Changsha 410073, China
2
National Innovation Institute of Defense Technology, Beijing 100010, China
3
Graduate School, National University of Defense Technology, Changsha 410073, China
Recently reported plasmon-induced transparency (PIT) in metamaterials endows the optical structures in classical systems with quantum optical effects. In particular, the nonreconfigurable nature in metamaterials makes multifunctional applications of PIT effects in terahertz communications and optical networks remain a great challenge. Here, we present an ultrafast process-selectable modulation of the PIT effect. By incorporating silicon islands into diatomic metamaterials, the PIT effect is modulated reversely, depending on the vertical and horizontal configurations, with giant modulation depths as high as 129% and 109%. Accompanied by the enormous switching of the transparent window, remarkable slow light effect occurs.
terahertz metamaterials
ultrafast photoswitching
plasmon-induced transparency
all-optical modulation
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Chinese Optics Letters
2021, 19(1): 013602
Plasmonics and Metamaterials
Active formatting modulation of electromagnetically induced transparency in metamaterials
Download:820次
Hao Sun
1
Yuhua Tang
1
Yuze Hu
2
Jie You
3
[ ... ]
Xin Zheng
3,*
Author Affiliations
Abstract
1
College of Computer, National University of Defense Technology, Changsha 410073, China
2
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
3
National Innovation Institute of Defense Technology, Beijing 100010, China
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.
terahertz metamaterials
ultrafast photoswitching
electromagnetically induced transparency
all-optical device
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Chinese Optics Letters
2020, 18(9): 092402
Surface Optics and Plasmonics
Ultrafast polarization-dependent all-optical switching of germanium-based metaphotonic devices
Download:559次
Hao Sun
1†
Yuze Hu
2†
Yuhua Tang
1†
Jie You
3
[ ... ]
Xin Zheng
3,*
Author Affiliations
Abstract
1
College of Computer, National University of Defense Technology, Changsha 410073, China
2
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
3
National Innovation Institute of Defense Technology, Academy of Military Sciences PLA China, Beijing 100071, China
Metamaterials play an important role in the modulation of amplitude and group delay in the terahertz (THz) regime on account of their optical properties, which are rare in natural materials. Here an ultrafast anisotropic switch of the plasmon-induced transparency (PIT) effect is experimentally and numerically demonstrated by metamaterial devices composed of two pairs of planar split-ring resonators and a pair of closed-ring resonators. By integration with a germanium (Ge) film, a recovery time of 3 ps and a decay constant of 785 fs are realized in the metadevice. Stimulated by the exterior optical pump, the PIT windows at different frequencies are switched off with an excellent property of slow light for vertical and horizontal THz polarizations, realizing an astonishing modulation depth as high as 99.06%. This work provides a new platform for ultrafast anisotropic metadevices tunable for amplitude and group delay.
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Photonics Research
2020, 8(3): 03000263
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