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Micro-cavity gas and vapor sensors and detection methods

Invented by: Andrea M. Armani
Pasadena, CA

Tsu-Te J. Su
Boca Raton, FL

Richard C. Flagan
Pasadena, CA

Scott E. Fraser
Pasadena, CA

Originally Assigned to: California Institute of Technology
Pasadena, CA
[Now assigned to . . .]

Issued:2012-01-31
Filed:2008-10-01
Application No:12243580
Examined by:Ton; Tri T

Micro-cavity gas or vapor sensors and gas or vapor detection methods. Optical energy is introduced into a resonant micro-cavity having a deformable coating such as a polymer. The coating swells or expands when it is exposed to or absorbs a gas or vapor, thereby changing the resonant wavelength of optical energy circulating within the micro-cavity/coating. Expansion or swelling of the coating may be reversible such that it contracts when gas or vapor diffuses from the coating. The coating deformation and/or a change of one or more optical properties of the optical energy circulating within the micro-cavity are used to detect the presence of the gas or vapor or molecules or particulates thereof.

[pdf] U.S. Pat. No. 8,107,081

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