Monitoring adsorption and sedimentation using evanescent-wave cavity ringdown ellipsometry

作者：Stamataki Katerina; Papadakis Vassilis; Everest Michael A; Tzortzakis Stelios; Loppinet Benoit; Rakitzis T Peter^*

来源：Applied Optics, 2013, 52(5): 1086-1093.

DOI：10.1364/AO.52.001086

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 Delta 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 Delta. We show that EW-CRDE provides a sensitive method for the measurement of. and demonstrates precision in Delta of about 10(-4) deg.

• 出版日期2013-2-10