Tittl, AndreasAndreasTittlMai, PatrickPatrickMaiTaubert, RichardRichardTaubertDregely, DanielDanielDregelyLiu, NaNaLiuGiessen, HaraldHaraldGiessen2026-03-112026-03-112011-10-12Nano Letters 11 (10): 4366-4369 (2011)https://hdl.handle.net/11420/61995We 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.en1530-699220111043664369hydrogen sensingLSPR resonancespalladiumperfect absorbersPlasmonicssensorTechnology::600: TechnologyJournal Article10.1021/nl202489g