Tunable and switchable bifunctional meta-surface for plasmon-induced transparency and perfect absorption

Abstract

Tunable multi-function metasurfaces have become the latest research frontiers in planar optics. In this study, a dynamically tunable plasmon-induced transparency (PIT) structure based on a graphene split-ring resonator and graphene ribbon is proposed. The influences of the structural parameters and graphene Fermi energy on the PIT response were investigated both analytically and numerically simulations. The inclusion of an additional vanadium dioxide (VO2) substrate layer enables the metasurface to achieve dynamic switching between PIT and perfect absorption using the phase change property of VO2. The new metasurface device exhibits the PIT effect when the VO2 layer is in an insulating state and acts as a perfect absorber when it is in a metallic state. Moreover, the response of the two functions can be easily adjusted dynamically by changing the Fermi energy of graphene. In addition, both functions were highly sensitive to changes in the ambient refractive index. The results of this work have potential applications in slow-light devices, optical switches, modulators, perfect absorbers, highly sensitive sensors, and multifunctional devices.

Electro-optic tuning of terahertz Yagi-Uda antenna arrays through liquid crystal reorientation

“…Metamaterials have attracted increased attention due to their remarkable properties, including negative refraction, cloaking, advanced lensing, dynamic tunability in plasmon-induced transparency, and perfect absorption [1][2][3]. Perfect metamaterial absorbers, particularly those employing antenna configurations such as Yagi-Uda structures, demonstrate highly directional resonance properties and facilitate near-perfect absorption at specific wavelengths [4][5][6].…”

Switching of electromagnetic induced transparency in terahertz metasurface

“…By providing external stimuli like thermal and electrical pulse it changes its phase to behave as conductor as well as insulator. Functional and tunable THz metasurfaces have been reported in which VO 2 is used to switch to properties of metasurface with its phase transition property [16][17][18][19]. However, phase change in VO 2 is bidirectional that means insulator to conducting and vice versa.…”

Liquid crystal-enabled tunability of Yagi-Uda antenna resonant properties

“…These materials have demonstrated capabilities, such as negative refraction, cloaking, advanced lensing, dynamically tunable plasmon-induced transparency, and perfect absorption 1 – 7 Unlike traditional materials, the distinguishing attributes of metamaterials stem not from their elemental composition, but rather from their meticulously designed structure 8 – 14 This structural dependency of their properties offers potential for designing groundbreaking devices catering to various microwave and optical applications 15 …”