title: Palladium-based plasmonic perfect absorber in the visible wavelength range and its application to hydrogen sensing.
abstract: We report on the experimental realization of a palladium-based plasmonic perfect absorber at visible wavelengths and its application to hydrogen sensing. Our design exhibits a reflectance <0.5% and zero transmittance at 650 nm and the operation wavelength of the absorber can be tuned by varying its structural parameters. Exposure to hydrogen gas causes a rapid and reversible increase in reflectance on a time scale of seconds. This pronounced response introduces a novel optical hydrogen detection scheme with very high values of the relative intensity response.
authors.affiliation: 4th Physics Institute and Research Center SCOPE,  University of Stuttgart , D-70569 Stuttgart, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Tittl
authors.forename: Patrick
authors.initials: P
authors.lastname: Mai
authors.forename: Richard
authors.initials: R
authors.lastname: Taubert
authors.forename: Daniel
authors.initials: D
authors.lastname: Dregely
authors.forename: Na
authors.initials: N
authors.lastname: Liu
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen