Enhanced spatial near-infrared modulation of graphene-loaded perfect absorbers using plasmonic nanoslits.


Journal Article

Modulating spatial near-infrared light for ultra-compact electro-optic devices is a critical issue in optical communication and imaging applications. To date, spatial near-infrared modulators based on graphene have been reported, but they showed limited modulation effects due to the relatively weak light-graphene interaction. In combination with graphene and metallic nanoslits, we design a kind of ultrathin near-infrared perfect absorber with enhanced spatial modulation effects and independence on a wide range of incident angles. The modulated spectral shift of central wavelength is up to 258.2 nm in the near-infrared range, which is more promising in applications than state-of-the-art devices. The modulation enhancement is attributed to the plasmonic nanoslit mode, in which the optical electric field is highly concentrated in the deep subwavelength scale and the light-graphene interaction is significantly strengthened. The physical insight is deeply revealed by a combination of equivalent circuit and electromagnetic field analysis. The design principles are not only crucial for spatial near-infrared modulators, but also provide a key guide for developing active near-infrared patch nanoantennas based on graphene.

Full Text

Duke Authors

Cited Authors

  • Cai, Y; Zhu, J; Liu, QH; Lin, T; Zhou, J; Ye, L; Cai, Z

Published Date

  • December 2015

Published In

Volume / Issue

  • 23 / 25

Start / End Page

  • 32318 - 32328

PubMed ID

  • 26699022

Pubmed Central ID

  • 26699022

Electronic International Standard Serial Number (EISSN)

  • 1094-4087

International Standard Serial Number (ISSN)

  • 1094-4087

Digital Object Identifier (DOI)

  • 10.1364/oe.23.032318


  • eng