Electric field-induced switching of bands in graphene-assisted metamaterial absorber

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2024-12-26 DOI:10.1016/j.ijleo.2024.172190

Amrendra Kumar , Raghwendra Kumar

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引用次数: 0

Abstract

A dual-band metamaterial absorber based on graphene is designed and numerically analyzed for operation at near-infrared frequencies. The structure comprises a one-dimensional silicon grating placed on a single layer graphene, supported by a gold substrate. The working mechanisms of the absorber are understood with the help of numerical simulations, which are performed using Computer Simulation Technology (CST) Microwave Studio. The simulation results indicate that the critical coupling enabled through the guided-mode resonance in the system significantly enhances the dual-band absorption. The absorber demonstrates two narrow absorption bands with corresponding absorptances of about 1 and 0.97 at wavelengths of 665.58 nm and 1134 nm, respectively. The number of absorption bands in this design can be electrically adjusted by leveraging the tunable conductivity of graphene. The absorber can be used as a dual-band absorber/single-band absorber or alike a perfect reflector. The aspects of different geometrical parameters like periodicity, width of the grating ridge, height/depth of the grating ridge and chemical potential of graphene are investigated in detail. Given its dual resonance wavelengths, high absorptance, and tunable band-switching capability, this absorber shows great potential for various applications at near-infrared frequencies.

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来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.