A silicon microsystem-miniaturised infrared spectrometer

A miniaturised multipurpose infrared analyser has been developed. This comprises an electrically modulatable infra-red source, an electrically tunable Fabry-Perot pass band filter, an integrated circuit and a photodetector, all silicon microfabricated and assembled on the same silicon substrate. The infrared source and the detector are monolithically integrated in the substrate. The Fabry-Perot interferometer is flip-chip bonded and the IC-circuit wire-bonded. The whole spectrometer assembly is in a DIL package, having holes for the incoming and outgoing radiation. The dimensions of the spectrometer silicon substrate are 5/spl times/15 mm/sup 2/.