Authors: Saavedra, S.S.; Reichert, W.M.

Source: Applied Spectroscopy, Volume 44, Issue 7, Pages 1101-1231 (August 1990) , pp. 1210-1217(8)

Publisher: Society for Applied Spectroscopy

Abstract:

We have investigated the light coupling behavior of prism-coupled waveguides adjacent to liquid superstrates. A flow cell was used for delivering the liquid superstrates to the waveguide surface. The incoupled angles and outcoupled mode patterns were collected from polystyrene waveguides subjected to superstrates of air, water, and dimethylsulfoxide. Results showed that poor coupling and significant mode scrambling were observed when liquids were infused into the flow cell volume. The poor waveguiding characteristics were found to be caused by the presence of air in the prism coupling gaps. Poor coupling was eliminated for a water superstrate by ensuring that water also occupied the prism coupling gaps. The mode coupled into the water-coupled waveguide with a water superstrate was always the most intense mode in the outcoupled pattern. In this manner it was shown that a refractive index mismatch between the coupling gap and the superstrate will lead to a waveguide with measured coupling angles that are completely insensitive to changes in superstrate refractive index.

Keywords: Fluorescence; Luminescence; Analytical methods; Optics; Reflectance spectroscopy; Surface analysis

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702904086579

Affiliations: 1: Department of Biomedical Engineering and Center for Emerging Cardiovascular Technologies, Duke University, Durham, North Carolina 27706

Publication date: 1990-08-01

More about this publication?

• The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge.
  
  Previously published as Bulletin (Society for Applied Spectroscopy)
• Editorial Board
• Information for Authors
• Submit a Paper
• Subscribe to this Title
• Membership Information
• Request copyrighted SAS materials
• Spectroscopic Nomenclature
• Focus Compendium
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Analytical Chemistry
• By this author: Saavedra, S.S. ;  Reichert, W.M.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers