Single and double structural resonances in the total Raman- or fluorescence-scattering cross section of spherical dielectric particles are theoretically investigated. We found appreciable differences in the resonance heights and in the distributions of the sources of the Raman-scattered light inside the particle for the emission of dipoles induced parallel to the exciting field (p = αE), designated as directed emission, and the emission of orientation-averaged dipoles. The influence of radial symmetric concentration profiles on Raman or fluorescent scattering in the case of the excitation of double structural resonances is investigated. We show that the resonance heights and the radial positions associated with the spherical layers probed by the resonances depend on the concentration profiles, the mode type of the resonances, and the emission characteristics (directed or orientation-averaged emission) of the probed molecules.
© 1996 Optical Society of America.
S. Lange and G. Schweiger, "Structural resonances in the total Raman- and fluorescence-scattering cross section: concentration-profile dependence," J. Opt. Soc. Am. B 13, 1864-1872 (1996)