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

doi:10.1021/nl302746n

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

Physics

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	5626-5631
Number of pages	6
Journal	Nano letters
Volume	12
Issue number	11
DOIs	https://doi.org/10.1021/nl302746n
State	Published - Nov 14 2012

All Science Journal Classification (ASJC) codes

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

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10.1021/nl302746n

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AU - Gan, Xuetao

AU - Mak, Kin Fai

AU - Gao, Yuanda

AU - You, Yumeng

AU - Hatami, Fariba

AU - Hone, James

AU - Heinz, Tony F.

AU - Englund, Dirk

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AB - 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.

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