title: Blue-shift of surface plasmon resonance in a metal nanoslit array structure.
abstract: The adsorption of a self-assembled monolayer of molecules on a metal surface commonly causes a red-shift in its surface plasmon resonance. We report that the anomalous dispersion of surface plasmons in a Au nanoslit array structure can cause a blue-shift of optical transmission upon adsorption of a non-absorbing self-assembled monolayer of molecules. We develop a simple model that explains the blue-shift observed in the transmission spectra with monolayer adsorption in terms of the interplay of anomalous dispersion and the cavity resonance of surface plasmons in the nanoslit array.
authors.affiliation: Department of Electrical and Computer Engineering and Petersen Institute of NanoScience and Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.
authors.forename: Yun Suk
authors.initials: YS
authors.lastname: Jung
authors.forename: Jeff
authors.initials: J
authors.lastname: Wuenschell
authors.forename: Hong Koo
authors.initials: HK
authors.lastname: Kim
authors.forename: Palwinder
authors.initials: P
authors.lastname: Kaur
authors.forename: David H
authors.initials: DH
authors.lastname: Waldeck