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.
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