title: Strong enhancement of light-matter interaction in graphene coupled to a photonic crystal nanocavity.
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.
authors.affiliation: Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Xuetao
authors.initials: X
authors.lastname: Gan
authors.forename: Kin Fai
authors.initials: KF
authors.lastname: Mak
authors.forename: Yuanda
authors.initials: Y
authors.lastname: Gao
authors.forename: Yumeng
authors.initials: Y
authors.lastname: You
authors.forename: Fariba
authors.initials: F
authors.lastname: Hatami
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.forename: Tony F
authors.initials: TF
authors.lastname: Heinz
authors.forename: Dirk
authors.initials: D
authors.lastname: Englund