ELECTROMAGNETIC WAVE DETECTOR WITH AN OPTICAL COUPLING SURFACE COMPRISING LAMELLAR PATTERNS

摘要

The invention relates to an electromagnetic wave detector with an optical coupling surface comprising lamellar patterns. The inventive detector consists of a multi-quantum well structure which operates on interband or intersubband transitions by absorption of radiation with a wavelength of lambda, which has a polarisation comprising a component that is perpendicular to the plane of the multi-quantum well structure, and which comprises means for the optical coupling of said radiation. The invention is characterised in that the coupling means comprise a set of first lamellar diffractive patterns (Mpi) which are distributed along at least one axis (Dx) and a set of second lamellar diffractive patterns (Msj) which are distributed along at least one second axis (Dy), said first and second axes being perpendicular to one another and located in a plane that is parallel to the plane of the multi-quantum well structure. The invention can be used for infrared detection.