Dual-frequency tunable unidirectional reflectionless propagation in non-Hermitian graphene plasmonic waveguide system

Ding, Jian; Wang, Yueke

doi:10.1016/j.optmat.2020.110515

Cited by 2 publications

(1 citation statement)

References 46 publications

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“…For the consideration of dynamic manipulation of electromagnetic waves, an electrical approach for the tunable UR would be very attractive. Thanks to the key feature of tunable surface conductivity of graphene [32][33][34], and quite recently, Ding et al successfully proposed graphene plasmonic waveguide system to realize tunable UR propagation by applying external voltage [35]. Soojeong Baek hybridised gated graphene microribbons with non-Hermitian metasurfaces and demonstrate the electrically controlled probing of polarisation eigentransmission surfaces along with the corresponding eigenstates [36].…”

Section: Introductionmentioning

confidence: 99%

Tunable unidirectional reflectionless propagation in non-hermitian graphene-based metasurface

Huang,

Tang,

Yan

2023

Phys. Scr.

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In this paper, we propose an graphene-based non-Hermitian metasurface and numerically investigate a tunable unidirectional reflectionless phenomenon for the THz region. The metasurface is composed of cascaded square graphene patch and its complementary structure separated by a thin dielectric layer. By simply selecting the thickness of the dielectric layer, the backward reflection for our structure is zero, and the corresponding forward reflection is about 35% at 31.15 THz. The coupled mode theory and the non-Hermitian scattering matrix are used to show that unidirectional reflectionless is responsible for the exceptional point. The Fermi energy of the graphene can actively tune the one-way zero reflection frequency. By varying the Fermi energy from 0.56 eV to 0.64 eV, a spectral blue shift of one-way zero reflection from 29.6 THz to 32.2 THz is obtained, maintaining the same structure. We believe that the proposed scheme will provides more flexible opportunities to realize unidirectional invisibility, diode-like device, on-chip sensors and filters.

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Section: Introductionmentioning

confidence: 99%

Tunable unidirectional reflectionless propagation in non-hermitian graphene-based metasurface

Huang,

Tang,

Yan

2023

Phys. Scr.

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Dual-band unidirectional reflectionless phenomenon based on high-order plasmon resonators in plasmonic waveguide system

Zhang

Jin

et al. 2022

J. Nonlinear Optic. Phys. Mat.

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We investigate the dual-band unidirectional reflectionless phenomenon and near perfect absorption using high-order plasmon resonators at exceptional points based on near-field coupling in plasmonic waveguide system. The system consists of two high-order plasmon resonators end-coupled to a metal-insulator-metal plasmonic waveguide. The reflection for forward (backward) direction is close to 0.85 (0.74), while for backward (forward) direction is approximate to 0 (0) at a frequency of 199.8[Formula: see text]THz (206.1[Formula: see text]THz), and the quality factor of absorption spectrum is about 257.6 (217.2) at 206.1[Formula: see text]THz (199.8[Formula: see text]THz) for forward (backward) direction.

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Dual-frequency tunable unidirectional reflectionless propagation in non-Hermitian graphene plasmonic waveguide system

Cited by 2 publications

References 46 publications

Tunable unidirectional reflectionless propagation in non-hermitian graphene-based metasurface

Tunable unidirectional reflectionless propagation in non-hermitian graphene-based metasurface

Dual-band unidirectional reflectionless phenomenon based on high-order plasmon resonators in plasmonic waveguide system

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