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Active focusing and manipulation of light beam through Ag grating covered by graphene

Active focusing and manipulation of light beam through Ag grating covered by graphene Abstract.An electrically controllable focal length is proposed for the visible wavelength range. The proposed structure is composed of a graphene sheet placed on a silver grating. The effect of the chemical potential variation of the graphene sheet on the light wave deflection, and hence the focal length of the structure, is investigated. The results of the full-wave simulation analysis based on the finite difference time domain (FDTD) method show that the focal length of the structure varies by approximately 7.82λ through changing the chemical potential of graphene from 0.1 to 1 eV. In addition, a generalized equivalent circuit model is introduced for the analysis of the proposed tunable graphene structure. The achieved results based on the circuit model match well with those based on the FDTD method. The proposed structure has the potential to be used in imaging devices and optical sensors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Nanophotonics SPIE

Active focusing and manipulation of light beam through Ag grating covered by graphene

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Publisher
SPIE
Copyright
© 2022 Society of Photo-Optical Instrumentation Engineers (SPIE)
ISSN
1934-2608
eISSN
1934-2608
DOI
10.1117/1.jnp.16.016008
Publisher site
See Article on Publisher Site

Abstract

Abstract.An electrically controllable focal length is proposed for the visible wavelength range. The proposed structure is composed of a graphene sheet placed on a silver grating. The effect of the chemical potential variation of the graphene sheet on the light wave deflection, and hence the focal length of the structure, is investigated. The results of the full-wave simulation analysis based on the finite difference time domain (FDTD) method show that the focal length of the structure varies by approximately 7.82λ through changing the chemical potential of graphene from 0.1 to 1 eV. In addition, a generalized equivalent circuit model is introduced for the analysis of the proposed tunable graphene structure. The achieved results based on the circuit model match well with those based on the FDTD method. The proposed structure has the potential to be used in imaging devices and optical sensors.

Journal

Journal of NanophotonicsSPIE

Published: Jan 1, 2022

Keywords: focusing; manipulation; grating; graphene; controllable focal length; circuit model

References