title: Integrated optical attenuated total reflection spectrometry of aqueous superstrates using prism-coupled polymer waveguides.
abstract: Attenuated total reflection (ATR) spectrometry of aqueous solutions in contact with polystyrene integrated optical waveguides has been investigated. The mode-dependent absorption of evanescent energy by fluorescein solutions adjacent to the waveguide surface was measured and compared to theoretical predictions based on a ray optics approach. Although enhanced sensitivity was observed with increasing mode number, the sensitivity for the highest order mode was less than that predicted by theory.
authors: Department of Biomedical Engineering, Duke University, Durham, North Carolina 27706.
authors: S S
authors: SS
authors: Saavedra
authors: W M
authors: WM
authors: Reichert
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D013053:Spectrophotometry / Q000379:methods; D014867:Water
chemical_list: D011108:Polymers; D012996:Solutions; D014867:Water