Evanescent-wave IR spectroscopy of single-bilayer membranes coated on chalcogenide fibers: sensitivity improvements using a diamond rod coupler between fiber and source

Mark S. Braiman, Roy E. Jonas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

By means of evanescent wave absorption spectroscopy of single-bilayer biological membranes coated on optical fibers, we have measured such phenomena as lipid phase transitions and incorporation into the bilayer of small antibiotic peptides. A key innovation which has resulted in a substantial increase in sensitivity is our use of a 500 μm diameter diamond rod as a direct optical coupling device between an IR blackbody source and the 500 μm optical fiber. One of the rod's ends is in direct contact with the hot SiC source, while the other abuts the cleaved end of the AsSeTe fiber. The fiber passes through a custom-built Langmuir-Blodgett trough, then into the emission port of our spectrometer where its output is collimated into the interferometer. An important property of our method of coupling light into the fiber is that it allows the excitation of a very wide range of the fiber's optical modes. This has allowed us to obtain excellent evanescent-wave spectra of liquids even using fibers with the protective plastic coating still on them.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsRobert A. Lieberman
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages402-411
Number of pages10
ISBN (Print)0819409758
StatePublished - 1993
Externally publishedYes
EventChemical, Biochemical, and Environmental Fiber Sensors IV - Boston, MA, USA
Duration: Sep 8 1992Sep 9 1992

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume1796
ISSN (Print)0277-786X

Other

OtherChemical, Biochemical, and Environmental Fiber Sensors IV
CityBoston, MA, USA
Period9/8/929/9/92

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Braiman, M. S., & Jonas, R. E. (1993). Evanescent-wave IR spectroscopy of single-bilayer membranes coated on chalcogenide fibers: sensitivity improvements using a diamond rod coupler between fiber and source. In R. A. Lieberman (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 402-411). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1796). Publ by Society of Photo-Optical Instrumentation Engineers.