A device for utilizing an optical infrared emitter/detector to sense substances of interest is provided. The infrared emitter/detector comprises a single crystal semiconductor, photonic band gap structure which functions both as an infrared emitter, a narrow-band filter, and as a broad-band infrared...http://www.google.de/patents/US6756594?utm_source=gb-gplus-sharePatent US6756594 - Micromachined tuned-band hot bolometer emitter
