Integrated optical attenuated total reflection spectrometry of aqueous superstrates using prism-coupled polymer waveguides.
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.
Saavedra
S S
SS
Department of Biomedical Engineering, Duke University, Durham, North Carolina 27706.
Reichert
W M
WM
D002623:Chemistry Techniques, Analytical / Q000379:methods*; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D013053:Spectrophotometry / Q000379:methods; D014867:Water
D011108:Polymers; D012996:Solutions; D014867:Water