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Proceedings Paper

Fabry-Perot resonators for high-resolution infrared gas sensors
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Paper Abstract

A new Fabry-Perot filter based on a silicon wafer spacer is proposed in this work. IR gas sensors based on these filters would combine excellent selectivity and signal-to-noise ratio with an overall scheme similar to that of the simplest non-dispersive IR sensors. The filter can be fitted to the fine structure of different gases, in particular those diatomic with unlike atoms as carbon monoxide among others. The spacer of the filter is a silicon wafer of defined thickness. Fine tuning to gas absorption peaks can be reached by coupling it to other multilayers. In this work the properties of silicon wafers as spacers of the proposed filters are studied. From the study it derives that the most determining factor of the filter properties is the loss of coherence caused by surface roughness. However, as we demonstrate in this work, surface roughness limitations are not very severe and easily obtained by standard polishing procedures.

Paper Details

Date Published: 19 August 1996
PDF: 12 pages
Proc. SPIE 2776, Developments in Optical Component Coatings, (19 August 1996); doi: 10.1117/12.246833
Show Author Affiliations
Jesus Meneses, Univ. Carlos III (Spain)
Fernando Lopez, Univ. Carlos III (Spain)
Juan Melendez, Univ. Carlos III (Spain)
Antonio J. de Castro, Univ. Carlos III (Spain)
Salvador Bosch, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 2776:
Developments in Optical Component Coatings
Ian Reid, Editor(s)

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