In this study we will design photonic structures whose spectral properties are particularly sensitive to the environmental modifications, and we will present measurement system that allows to detect these small variations. For this purpose, we will focus on the phase at the reflection on periodic structures, in particular for the critical coupling points for which the phase variation is abrupt. The measurement method that we develop consists in an original holographic interferometric setup based on wavefront shaping that allow a very stable phase measurement.The fabrication of a temperature sensor based on these two principles has allowed us to experimentally reach phase sensitivities up to 39°/°C.
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