Strong enhancement of light-matter interaction in graphene coupled to a photonic crystal nanocavity

Xuetao Gan, Kin Fai Mak, Yuanda Gao, Yumeng You, Fariba Hatami, James Hone, Tony F. Heinz, Dirk Englund

Research output: Contribution to journalArticlepeer-review

202 Scopus citations

Abstract

We demonstrate a large enhancement in the interaction of light with graphene through coupling with localized modes in a photonic crystal nanocavity. Spectroscopic studies show that a single atomic layer of graphene reduces the cavity reflection by more than a factor of one hundred, while also sharply reducing the cavity quality factor. The strong interaction allows for cavity-enhanced Raman spectroscopy on subwavelength regions of a graphene sample. A coupled-mode theory model matches experimental observations and indicates significantly increased light absorption in the graphene layer. The coupled graphene-cavity system also enables precise measurements of graphene's complex refractive index.

Original languageEnglish (US)
Pages (from-to)5626-5631
Number of pages6
JournalNano letters
Volume12
Issue number11
DOIs
StatePublished - Nov 14 2012

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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