Tunable anisotropic absorption based on black phosphorous multilayer structures

Li, Hongxu; Zhang, Xin; Xiao, Xisheng; Xu, Yanli

doi:10.1016/j.ijleo.2021.166579

Cited by 1 publication

(2 citation statements)

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“…where j is the relevant direction, D j is the Drude weight, and η = 10 meV describes the relaxation rate. Because the electron-doping and hole-doping types are equivalent in the numerical simulation of the dielectric constant of BP [43,61], for n-doped BP, the relationship between doping concentration and Fermi level can be described as [62]…”

Section: Structure Model and Methodsmentioning

confidence: 99%

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Broadband electromagnetically induced transparency-like manipulation of graphene–black phosphorus hybrid metasurface

Xu¹,

Li²,

Wu³

et al. 2021

J. Phys. D: Appl. Phys.

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Plasmonics of two-dimensional materials provides a platform for enhancing light-matter interactions and offers a variety of novel applications in the terahertz range. In this work, we theoretically and numerically investigate the broadband tunable electromagnetically induced transparency-like (EIT)-like effect based on graphene-black phosphorus (G-BP) metasurface. The designed structural unit consists of a circular G-BP disk placed between two parallel G-BP strips, both of which operate in bright mode. It can achieve a broadband EIT-like effect that performs beyond individual graphene and BP films, where the underlying physical mechanism is the near-field coupling of resonator elements and the coupling of two bright-bright modes. In addition, we can flexibly adjust the transparency window of the EIT-like effect by changing the geometric parameters, polarization angle, and Fermi energy level of G-BP. The finite-difference time-domain simulation results agree well with the results of the theoretical analysis based on the coupled Lorentz oscillator model. Moreover, the proposed structure exhibits excellent dispersion accompanied with a group index of ∼60, which provides theoretical guidance for slow-light optical devices.

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Section: Structure Model and Methodsmentioning

confidence: 99%

“…For monolayer BP, ϵ r = 5.76. BP has different effective masses in the armchair (x) direction and zigzag (y) directions, so it has an anisotropic relative dielectric constant; thus, an anisotropic optical response can be obtained [62].…”

Section: Structure Model and Methodsmentioning

confidence: 99%