Tunability of optical absorption in a heterostructure with an embedded graphene sliver

S. Rakheja, P. Sengupta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A key design component of optical instruments employed in diverse roles such as detectors, optical resonators, and thermal-imaging cameras is enhancement of the optical absorption. The efficiency of absorption in conventional thin metallic films can be further improved by replacing them with graphene detectors. While graphene exhibits a high absorption and quantum efficiency for light-matter interactions [1-2], the optical absorption of single-atom layer graphene is poor to be an efficient photo-detector [3]. Its adaptability for various frequency ranges is also limited by a flat absorption spectrum in the visible to near-infrared region. In this work, using a transfer matrix approach [4], we present methods to enhance the optical absorption in a graphene sliver sandwiched between dielectric media via adjustments to the thickness of the dielectrics, incident angle and wavelength of the EM wave, and chemical potential of the graphene layer. The model equations are presented in Table I.

Original languageEnglish (US)
Title of host publication73rd Annual Device Research Conference, DRC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages143-144
Number of pages2
ISBN (Electronic)9781467381345
DOIs
StatePublished - Aug 3 2015
Event73rd Annual Device Research Conference, DRC 2015 - Columbus, United States
Duration: Jun 21 2015Jun 24 2015

Publication series

NameDevice Research Conference - Conference Digest, DRC
Volume2015-August
ISSN (Print)1548-3770

Other

Other73rd Annual Device Research Conference, DRC 2015
CountryUnited States
CityColumbus
Period6/21/156/24/15

Keywords

  • Absorption
  • Conductivity
  • Dielectrics
  • Graphene
  • Optical films
  • Optical polarization
  • Optical resonators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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