Design of a mid infrared resonant grating filter

Resonant grating filters are promising alternatives to conventional spectral filters for narrowband free-space filtering. The high performances achieved experimentally by such filters in the near infrared have lead to a study of resonant grating filters in the mid infrared. In this paper, we show that GaAs/AlGaAs system is an interesting system for the realization of such filters and that limitations induced by the high optical index of GaAs can be overcome by a careful design.