Abstract
In this letter, we propose a structure based on double-layer graphene-based planar chiral metasurface with a J-shaped pattern to generate asymmetric transmission for circularly polarized waves in the mid-infrared region. Asymmetric transmission of the double-layer structure can reach to 16.64%, which is much larger than that of the monolayer. The mechanism of asymmetric transmission is attributed to enantiomerically sensitive graphene's surface plasmons. Besides, asymmetric transmission can be dynamically tuned by changing the Fermi energy and is affected by intrinsic relaxation time. All simulations are conducted by the finite element method. Our findings provide a feasibility of realizing photonic devices in tunable polarization-dependent operation, such as asymmetric wave splitters and circulators.
Highlights
In recent years, chiral metasurfaces have become more and more popular in many elds such as optics
We propose a structure based on double-layer graphene-based planar chiral metasurface with a J-shaped pattern to generate asymmetric transmission for circularly polarized waves in the mid-infrared region
Asymmetric transmission of chiral metasurfaces for circularly polarized waves can be de ned as the total transmission difference between the same handedness waves propagating in the opposite directions or the opposite handedness waves propagating in the same direction.[12]
Summary
Chiral metasurfaces have become more and more popular in many elds such as optics. The excitation of enantiomerically sensitive surface plasmons is a collective mode of electron oscillation at the interface of conductor and medium, which is in charge of asymmetric transmission for circularly polarized waves in planar chiral metasurfaces.[17,18,19]. People propose kinds of monolayer graphene chiral metasurface,[30,31] and study the asymmetric transmission for circularly polarized waves. In the monolayer metasurface which is composed of J-shaped hollow graphene patterns, the asymmetric transmission DT can reach a small value of 2.05% When another J-shaped pattern, which is designed to be rotated by 90 degrees a er being mirror symmetric operation with respect to the previous layer, is added, the asymmetric transmission DT can achieve 16.64%. Finite Element Method (FEM) simulations are conducted to verify our ndings
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