HIGH TIME-RESOLUTION ULTRASENSITIVE OPTICAL DETECTOR, USING GRATING COUPLING

摘要

This detector is intended to detect at least one photon and comprises a dielectric substrate (30), of index n_O; a detecting element (32) forming a serpentine, placed on the substrate and generating a signal using the energy of the photon(s); a dielectric grating, formed of lines of index n_H, alternating with lines of index n_B, avec n_Hn_O and n_Hn_B, the grating being placed above the detecting element, the set grating-element presenting a resonant absorption in a given incidence and for a given polarisation; and a superstratum (40) having a refractive index n_i, this superstratum being placed above the one-dimensional dielectric grating, n_H being furthermore greater than n_i.