title: Extraordinary optical absorption through subwavelength slits.
abstract: We report on the ability of resonant plasmonic slits to efficiently concentrate electromagnetic energy into a nanoscale volume of absorbing material placed inside or directly behind the slit. This gives rise to extraordinary optical absorption characterized by an absorption enhancement factor that well exceeds the enhancements seen for extraordinary optical transmission through slits. A semianalytic Fabry-Perot model for the resonant absorption is developed and shown to quantitatively agree with full-field simulations. We show that absorption enhancements of nearly 1000% can be realized at 633 nm for slits in aluminum films filled with silicon. This effect can be utilized in a wide range of applications, including high-speed photodetectors, optical lithography and recording, and biosensors.
authors.affiliation: Geballe Laboratory for Advanced Materials, Stanford, CA 94305, USA.
authors.forename: Justin S
authors.initials: JS
authors.lastname: White
authors.forename: Georgios
authors.initials: G
authors.lastname: Veronis
authors.forename: Zongfu
authors.initials: Z
authors.lastname: Yu
authors.forename: Edward S
authors.initials: ES
authors.lastname: Barnard
authors.forename: Anu
authors.initials: A
authors.lastname: Chandran
authors.forename: Shanhui
authors.initials: S
authors.lastname: Fan
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brongersma