Graphene-coated Cylindrical Nano-hole Arrays as Switchable and Re-configurable Reflector/Absorber Devices
Source abstract
Abstract
This paper proposes graphene-coated cylindrical nano-hole arrays as switchable and re-configurable reflector/absorber devices. Initially, a free-standing graphene-coated nano-hole array is considered, and its reflectivity engineering using the geometrical, material, and optical parameters is discussed in detail. It is observed that the electromagnetic reflection is due to the excitation of localized surface plasmon resonances in the cylindrical shells embedded in the low-index dielectric background. Later, a reflecting mirror is introduced as the substrate of the graphene-wrapped hole array, and higher-order plasmonic resonances are used to design optically re-configurable absorbers in different spectra. The high absorption rate is maintained for the oblique plane waves with a wide range of incident angles under transverse electric (TE) and transverse magnetic (TM) wave illumination. Finally, the metallic mirror is replaced by the VO2 phase change material to switch between the reflecting and absorbing modes. The switching capability arises from the robust performance of the reflecting mode with respect to the substrate height.
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Research context
OpenAlex topics: Metamaterials and Metasurfaces Applications · Advanced Antenna and Metasurface Technologies · Optical Wireless Communication Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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