• 文献标题:   Plasmon resonance enhanced mid-infrared generation by graphene on gold gratings through difference frequency mixing
  • 文献类型:   Article
  • 作  者:   CAO JJ, KONG Y, GAO SM, LIU C
  • 作者关键词:   midinfrared generation, difference frequency generation, surface plasmon, graphene
  • 出版物名称:   OPTICS COMMUNICATIONS
  • ISSN:   0030-4018 EI 1873-0310
  • 通讯作者地址:   Jiangnan Univ
  • 被引频次:   4
  • DOI:   10.1016/j.optcom.2017.04.023
  • 出版年:   2018

▎ 摘  要

Graphene has been demonstrated to have extraordinary large second order nonlinear susceptibility that can be applied in generating mid-infrared (MIR) and terahertz waves through the difference frequency process. In this study, we exploit the highly localized electric fields caused by plasmon resonances to increase the nonlinear response from graphene. The proposed structure contains a graphene sheet on a gold grating substrate that sustains both surface plasmons at the near-infrared on the gold surface and plasmons at the MIR on the graphene surface. Based on finite difference time domain (FDTD) numerical simulations, more than 3 orders of magnitude improvement of the MIR generation efficiency is obtained by placing graphene sheets on a gold grating substrate under resonance conditions instead of placing them on a flat substrate. With the same gold grating substrate, MIR waves tunable from 30 to 55 THz are generated by tuning the gate voltage of the graphene sheet. (C) 2017 Elsevier B.V. All rights reserved.