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5 February 2010 Polymer-coated vertical-cavity surface-emitting laser diode vapor sensor
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We report a new method for monitoring vapor concentration of volatile organic compounds using a vertical-cavity surface-emitting laser (VCSEL). The VCSEL is coated with a polymer thin film on the top distributed Bragg reflector (DBR). The analyte absorption is transduced to the electrical domain through modulation of the VCSEL output power as the polymer swell. We have investigated the responsivity of this technique experimentally using a plasma polymerized polystyrene coating and explain the results theoretically as a reflectance modulation of the top DBR.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thor Ansbæk, Claus H. Nielsen, Niels B. Larsen, Søren Dohn, Anja Boisen, Il-Sug Chung, David Larsson, and Kresten Yvind "Polymer-coated vertical-cavity surface-emitting laser diode vapor sensor", Proc. SPIE 7615, Vertical-Cavity Surface-Emitting Lasers XIV, 76150A (5 February 2010);

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