title: Microcavity-integrated graphene photodetector.
abstract: There is an increasing interest in using graphene (1, 2)  for optoelectronic applications. (3-19)  However, because graphene is an inherently weak optical absorber (only ≈2.3% absorption), novel concepts need to be developed to increase the absorption and take full advantage of its unique optical properties. We demonstrate that by monolithically integrating graphene with a Fabry-Pérot microcavity, the optical absorption is 26-fold enhanced, reaching values >60%. We present a graphene-based microcavity photodetector with responsivity of 21 mA/W. Our approach can be applied to a variety of other graphene devices, such as electro-absorption modulators, variable optical attenuators, or light emitters, and provides a new route to graphene photonics with the potential for applications in communications, security, sensing and spectroscopy.
authors.affiliation: Institute of Photonics, Vienna University of Technology, Gußhausstraße 27-29, 1040 Vienna, Austria.
authors.forename: Marco
authors.initials: M
authors.lastname: Furchi
authors.forename: Alexander
authors.initials: A
authors.lastname: Urich
authors.forename: Andreas
authors.initials: A
authors.lastname: Pospischil
authors.forename: Govinda
authors.initials: G
authors.lastname: Lilley
authors.forename: Karl
authors.initials: K
authors.lastname: Unterrainer
authors.forename: Hermann
authors.initials: H
authors.lastname: Detz
authors.forename: Pavel
authors.initials: P
authors.lastname: Klang
authors.forename: Aaron Maxwell
authors.initials: AM
authors.lastname: Andrews
authors.forename: Werner
authors.initials: W
authors.lastname: Schrenk
authors.forename: Gottfried
authors.initials: G
authors.lastname: Strasser
authors.forename: Thomas
authors.initials: T
authors.lastname: Mueller
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D008027:Light; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects*; D010783:Photometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D006108:Graphite