• 文献标题:   Active focusing and manipulation of light beam through Ag grating covered by graphene
  • 文献类型:   Article
  • 作  者:   MALEKPOUR M, ZAFARI S, MALEKPOUR N, KASHANI ZG
  • 作者关键词:   focusing, manipulation, grating, graphene, controllable focal length, circuit model
  • 出版物名称:   JOURNAL OF NANOPHOTONICS
  • ISSN:   1934-2608
  • 通讯作者地址:  
  • 被引频次:   1
  • DOI:   10.1117/1.JNP.16.016008
  • 出版年:   2022

▎ 摘  要

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 7.82 lambda 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. (C) 2022 Society of Photo-Optical Instrumentation Engineers (SPIE)