Influence of multilayer coating peculiarities on efficiency of surface plasmon resonance photodetector

A double metal layer system on the diffraction grating was used for increasing of efficiency of surface plasmon resonance (SPR) GaAs based photodetector. The design of it is based on commonly used thin metal films with optical constants that can be realized by using standard thermal evaporation techniques. The performance of detectors has been controlled over the wide range of visible spectrum by variation both geometric and structural parameters of diffraction grating. The sensitivity of the structures to changes in the angle of incidence, the wavelength, both the coating nature and index, etc. are presented.