In this work, we present the experimental investigations on a new SPR (Surface Plasmon Resonnace) sensor based on the switch measurement method. The sensor is realized with a deep metallic grating in our case coated with a Pd layer known for its sensitivity to hydrogen1 where the 0th and -1st orders crossed each other at a specific incident angular beam. By achieving a normalized difference between these two orders at this specific working point, any change in dielectric permittivity can be measured when hydrogen interacts with the Pd layer. The sensor developed in this study exhibits promising performance for hydrogen detection and provides proof of concept for the switch measurement method.
In this work, the effect of roughness on surface plasmon propagation along metallic gratings is investigated. In the case of a shallow sinusoidal grating, modeling that takes into account the surface roughness shows the modification of the coupling properties of the plasmon modes. In the case of a deep sinusoidal rough grating, modeling of the SPR response is compared to the experimental one, showing a strengthening of the intra-coupling between forward and backward plasmon modes. This study demonstrates that the effect of the surface roughness on plasmon propagation must be considered especially in the case of deep gratings.
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