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Planar Optical Waveguide Platform for Gas Sensing Using Liquid Crystal

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3 Author(s)
Wing Fat Ho ; City Univ. of Hong Kong, Kowloon, South Korea ; Hau Ping Chan ; Kun Lin Yang

We propose a simple method for detecting chemical gases using liquid crystal on a planar optical waveguide. Through measuring waveguide output power, this method detects changes in the director of liquid crystal molecules as well as the refractive index, which attributed to gas exposure. We demonstrate this idea by constructing a compact and fast-response ethanol gas sensor.

Published in:

Sensors Journal, IEEE  (Volume:13 ,  Issue: 7 )