Giessen, HaraldHaraldGiessenMai, PatrickPatrickMaiTittl, AndreasAndreasTittlLiu, NaNaLiuGrossmann, CorneliusCorneliusGrossmannSeidel, AndreasAndreasSeidelOrzekowsky, ReginaReginaOrzekowskyMeyrath, ToddToddMeyrath2026-03-112026-03-112010-119th IEEE Sensors Conference, SENSORS 2010https://hdl.handle.net/11420/61994In this contribution, we are going to present two plasmonic concepts for hydrogen sensing. Our first concept is based on metallic photonic crystals, where a gold grating together with a thin layer of Pd in combination with a waveguide of WO3 can give a strong resonance in the extinction or reflection spectrum. Upon hydrogen exposure, the WO3 undergoes a refractive index change, which will shift the spectral resonance. A suitably tuned laser or LED can interrogate this change and give an optical signal. Our second concept is based on a plasmonic metamaterial which comprises a perfect absorber. A layer made from Pd wires as placed on a spacer layer and a gold mirror. Suitable design parameters lead to a zero transmittance as well as zero reflectance for a given wavelength. Upon hydrogen exposure, this perfect absorption is distorted and reflected light can be detected.enTechnology::600: TechnologyConference Paper10.1109/ICSENS.2010.5690585