Ultrafast Frequency Shift of Electromagnetically Induced Transparency in Terahertz Metaphotonic Devices

Hu, Yuze; Jiang, Tian; Sun, Hao; Tong, Mingyu; You, Jinhong; Zheng, Xin; Xu, Zhongjie; Cheng, Xin

doi:10.1002/lpor.201900338

Cited by 39 publications

(18 citation statements)

References 87 publications

(106 reference statements)

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“…Based on the above analysis, it is worth highlighting that this fantastic x ‐polarized switching behavior occurs at low fluences (50 µJ/cm −2 for total compression), whereas the y ‐polarized case requires a much higher fluence (nearly 30 times higher). This signifies the ultrasensitive property of the x ‐polarized THz wave of photoswitches reported in previous studies, [ 22,33,50,63–68 ] which is promising for designing low threshold photoactive metamaterial.…”

Section: Resultssupporting

confidence: 76%

Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics

Hao

Zhang

et al. 2021

Laser & Photonics Reviews

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Recent progress in miniaturized photonic devices has promoted the development of metasurfaces for multidimensional manipulation of optical light fields. One significant example is the polarization multiplexing metadevice, which has earned considerable attention because of its low crosstalk and tremendous polarization‐controlled functionalities for numerous applications, such as wavefront steering, holography, and display. Here, a novel metasurface platform is demonstrated for photoactive terahertz switching by encoding the temporal modulation dynamic into the polarization channels. Coupled plasmonic resonators with four‐fold symmetry are utilized to exhibit an isotropic plasmon‐induced transparency analog resonance. Unlike typical optically tunable metamaterials that are limited to a single switching speed, this temporal modulation is multiplexed into two sets of polarization profiles. Specifically, the switching dynamic can be alternated between a quasi‐steady state with a recovery time larger than 2 ns and an ultrafast transient state with a recovery time of <25 ps in the orthogonal polarization channels. This extraordinary performance is attributed to the high contrast in crystallinity between two photoactive islands embedded in one‐unit cell. The long‐standing bottleneck of invariant switching dynamics in all‐optical metadevices is addressed, which provides a new paradigm for the design of future switchable metamaterial devices.

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Section: Resultssupporting

confidence: 76%

Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics

Hao

Zhang

et al. 2021

Laser & Photonics Reviews

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“…Optical switches are regarded as essential modules to dynamically alter optical signal transmission in the fully integrated photonic chips with an ultrafast operation speed. [207][208][209] The electro-optical, acousto-optical, magneto-optical, and opto-optical effects are the primary mechanisms commonly utilized in optical switching devices. [210] To construct more advanced optical switches with 2D materials, the specially-designed nanostructures, such as MRRs and PhCs are utilized.…”

Section: Switchesmentioning

confidence: 99%

Hybrid/Integrated Silicon Photonics Based on 2D Materials in Optical Communication Nanosystems

You¹,

Luo²,

Yang³

et al. 2020

Laser & Photonics Reviews

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Silicon (Si) photonics have established as leading technologies in addressing the rapidly increasing demands of huge data transfer in optical communication systems with compact footprints, small power consumption, and ultradense bandwidth, which are driven by the next generation supercomputers and big data era. Particularly, Si photonics will penetrate into optical communication links at an ever-small scale, namely chip-to-chip and on-chip. However, the nanostructures made of Si with an indirect bandgap are not ideal candidates for on-chip light sources, modulators, and photodetectors, which most-frequently require optical materials with direct bandgap. Thanks to the advent of graphene, transition metal dichalcogenides and other two-dimensional (2D) materials, which can facilitate extraordinary progresses in improving device performance at the ultrathin scale, their integration with Si photonics furnishes a heterogeneous platform to construct fully functional and highly integrated photonic communication systems. In this work, the current advancements in the on-chip applications of Si photonics-2D materials heterostructures, inclusive of all essential chip-scale modules and integrated circuits, as well as the future prospective and challenges are reviewed and discussed. The present study sets out to objectively measure the feasibility of the hybrid integration between Si photonics and 2D materials in on-chip optical communications and the advanced applications beyond.

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“…Compared to bright modes, which would naturally couple with free space electromagnetic fields, dark modes are excited by near-field coupling with the bright modes, exhibiting a narrower absorption [33] . Importantly, the plasmonic split-ring resonators (SRRs), closed-ring resonators (CRRs), and cut wire (CW) resonators are several meta-atom building blocks that can support bright modes and dark modes [34][35][36] .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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Ultrafast Frequency Shift of Electromagnetically Induced Transparency in Terahertz Metaphotonic Devices

Cited by 39 publications

References 87 publications

Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics

Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics

Hybrid/Integrated Silicon Photonics Based on 2D Materials in Optical Communication Nanosystems

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

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