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Title:
Raman scattering from surface molecules excited by guided optical waves and surface plasmons
Authors:
Swalen, J. D.; Rabolt, J. F.; Schlotter, N. E.; Knoll, W.; Girlando, A.; Philpott, M. R.
Affiliation:
AA(IBM Research Laboratory, San Jose, CA), AB(IBM Research Laboratory, San Jose, CA), AC(IBM Research Laboratory, San Jose, CA), AD(IBM Research Laboratory, San Jose, CA), AE(IBM Research Laboratory, San Jose, CA), AF(IBM Research Laboratory, San Jose, CA)
Publication:
IN: Scattering in optical materials; Proceedings of the Meeting, San Diego, CA, August 25-27, 1982 (A84-28543 12-74). Bellingham, WA, SPIE - The International Society for Optical Engineering, 1983, p. 31-37. (SPIE Homepage)
Publication Date:
00/1983
Category:
Optics
Origin:
STI
NASA/STI Keywords:
ELECTROMAGNETIC SURFACE WAVES, LIGHT SCATTERING, MOLECULAR EXCITATION, OPTICAL WAVEGUIDES, PLASMONS, RAMAN SPECTRA, LASER TARGET INTERACTIONS, METAL FILMS, MOLECULAR INTERACTIONS, OPTICAL PROPERTIES
Bibliographic Code:
1983SPIE..362...31S

Abstract

It is pointed out that, in general, scattering of laser radiation from a surface upon which molecules are deposited leads only extremely weak Raman signals since the number of molecules able to interact with the beam is very small. Use is made of integrated optics, that is, in the form of light propagation in dielectric waveguides and plasmon surface polaritons (surface electromagnetic waves) on metals in order to increase the number of interacting molecules and to greatly increase the strength of the optical field. The details of the techniques are described and illustrated with spectra from interfacial molecules. The optical properties of a film are determined by means of measurements of the angular dependence of the reflectivity or transmission of light. It is noted that an analysis of the results gives the film thickness and refractive index. The scattered light is then focused on the slit of a double monochromator and the Raman spectrum is recorded as a spectral shift from the exciting light.
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