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- W2238460013 abstract "Because of the low Raman scattering probability and the short optical paths in films and interfaces, several techniques to enhance Raman signals have been developed. Among these are interference enhancement in multilayer structures, path length extension by wave guide methods, coherent nonlinear Raman spectroscopies, and resonant Raman enhancement by the use of short wavelength excitation. We discuss the advantages and limitations of interference and resonance enhancement methods. A common theme of both methods is the measurement of a Raman excitation profile spectrum by tuning the probe laser wavelength across an optical interference passband or across the electronic bandgap of the film material. Although interference is an optical effect which enhances the Raman spectrum uniformly, under resonance Raman conditions selective enhancement is observed for vibrational modes which are strongly coupled to the allowed electronic transitions in the dielectric material. The principal limitation of resonance Raman probes of solid films is the optical damage threshold which is easily exceeded by typical uv pulsed probe power levels near the electronic band edge. 10 refs., 10 figs." @default.
- W2238460013 created "2016-06-24" @default.
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- W2238460013 date "1987-06-01" @default.
- W2238460013 modified "2023-09-24" @default.
- W2238460013 title "Raman enhancement methods for molecular structure characterization of optical thin films. [TiO/sub 2//SiO/sub 2/]" @default.
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