High speed tunable thermic modulation of far infrared waves

摘要

This paper proposes a new method for the high speed temporal modulation of infrared wave beams reflected from thin films of semiconductor plasma containing free carriers. The physical foundations of such a method, based on the non-linear and bi-stable properties of free carriers in these films, show possibilities of the elaboration of high-speed tunable modulators and polarizers. The bi-stable conditions are tunable by means of a magnetic field. The reflection of a continuous wave beam from the film with a tunable reflection coefficient leads to pulse shaping, pulse duration being as small as 10−9