Detection device for infrared and short wavelength radiation, used for thermal imaging, comprises array of band gap photosensors and reflecting surface

摘要

The device comprises an array (10) of band gap photosensors (40) separated by a distance less than the radiation wavelength, a number of periodic radiation-gathering structures connected to these photosensors, and a radiation reflecting surface which is offset with respect to the surface in which the photosensors are localized, over a distance less than the radiation wavelength. Radiation is captured by the combination of the radiation gathering structure and the reflective surface and directed towards the photosensors in order to generate a detection signal. Independent claims are also included for (a) a second radiation detection device comprising a periodic pattern of parallel, elongated photoconductive or photovoltaic band gap sensors separated from each other a distance less than the radiation wavelength, the pattern having a given radiation impedance, and further comprising a structure for supporting the sensors and adjusting the impedance to between the impedance of the sensors and the radiation impedance in free space, as well as comprising a means for electrically connecting the sensors in order to produce a detection signal when the device is exposed to radiation, and (b) a method for making the first device.