Palladium-based plasmonic perfect absorber in the visible wavelength range and its application to hydrogen sensing

Nano Lett. 2011 Oct 12;11(10):4366-9. doi: 10.1021/nl202489g. Epub 2011 Sep 7.


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.