Monitoring adsorption and sedimentation using evanescent-wave cavity ringdown ellipsometry

We monitor the adsorption of Rhodamine 800, and the sedimentation of a polytetrafluoroethylene (PTFE) suspension at the surface of a fused-silica prism, by measuring both the absorption and s-p phase shift Δ of a 740 nm probe laser beam, using evanescent-wave cavity ringdown ellipsometry (EW-CRDE)....

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Bibliographic Details
Published in:Applied optics (2004) 2013-02, Vol.52 (5), p.1086-1093
Main Authors: Stamataki, Katerina, Papadakis, Vassilis, Everest, Michael A, Tzortzakis, Stelios, Loppinet, Benoit, Peter Rakitzis, T
Format: Article
Language:English
Subjects:
Adsorption
Cavity ringdown
Ellipsometry
Monitoring
Polytetrafluoroethylenes
Rhodamine
Sedimentation
Surface chemistry
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Summary:We monitor the adsorption of Rhodamine 800, and the sedimentation of a polytetrafluoroethylene (PTFE) suspension at the surface of a fused-silica prism, by measuring both the absorption and s-p phase shift Δ of a 740 nm probe laser beam, using evanescent-wave cavity ringdown ellipsometry (EW-CRDE). The two systems demonstrate the complementary strengths of EW-CRDE, as the progress of adsorption of the Rhodamine 800 dye can only be observed sensitively via the measurement of absorption, whereas the progress of sedimentation of PTFE can only be observed sensitively via the measurement of Δ. We show that EW-CRDE provides a sensitive method for the measurement of Δ and demonstrates precision in Δ of about 10(-4) deg.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.52.001086