Strong Enhancement of Light鈥揗atter Interaction in Graphene Coupled to a Photonic Crystal Nanocavity

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• 作者：Xuetao Gan ; Kin Fai Mak ; Yuanda Gao ; Yumeng You ; Fariba Hatami ; James Hone ; Tony F. Heinz ; Dirk Englund
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：November 14, 2012
• 年：2012
• 卷：12
• 期：11
• 页码：5626-5631
• 全文大小：368K
• 年卷期：v.12,no.11(November 14, 2012)
• ISSN：1530-6992

文摘

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鈥揷avity system also enables precise measurements of graphene鈥檚 complex refractive index.

Keywords:

Graphene; photonic crystal cavity; optoelectronics; Raman spectroscopy