title: Monitoring adsorption and sedimentation using evanescent-wave cavity ringdown ellipsometry.
abstract: 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.
authors: Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion-Crete 71110, Greece.
authors: Katerina
authors: K
authors: Stamataki
authors: Vassilis
authors: V
authors: Papadakis
authors: Michael A
authors: MA
authors: Everest
authors: Stelios
authors: S
authors: Tzortzakis
authors: Benoit
authors: B
authors: Loppinet
authors: T
authors: T
authors: Peter Rakitzis