Giant terahertz-wave absorption by monolayer graphene in a total internal reflection geometry

Yoichi Harada, Muhammad Shoufie Ukhtary, Minjie Wang, Sanjay K. Srinivasan, Eddwi H. Hasdeo, Ahmad R.T. Nugraha, G. Timothy Noe, Yuji Sakai, Robert Vajtai, Pulickel M. Ajayan, Riichiro Saito, Junichiro Kono

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We experimentally demonstrated significant enhancement of terahertz-wave absorption in monolayer graphene by simply sandwiching monolayer graphene between two dielectric media in a total internal reflection geometry. In going through this structure, the evanescent wave of the incident terahertz beam interacts with the sandwiched graphene layer multiple (up to four) times at varying incidence angles. We observed extremely large attenuation (up to ∼70% per reflection), especially for s-polarized radiation. The experimental results are quantitatively consistent with our calculations, where we modeled the experiment as an electromagnetic wave reflection process in monolayer graphene. We also derived analytical expressions for the absorptance, showing that the absorptance is proportional to the amount of Joule heating on the graphene surface induced by the terahertz radiation.

Original languageEnglish
Pages (from-to)121-126
Number of pages6
JournalACS Photonics
Volume4
Issue number1
DOIs
Publication statusPublished - 2017 Jan 18

Keywords

  • Absorption
  • Graphene
  • Terahertz spectroscopy
  • Total internal reflection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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