Topics in Particle and Dispersion Science

Mie theory: Fluorescence emission resonances

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Sharp resonance peaks have also been observed when the source of light is the sphere itself, as in fluorescence emission (for example, Benner RE et al 1980). The location and shapes of these resonance peaks as well as that of the ripple for single spheres in suspension was found to coincide with those for the scattered light at the wavelength corresponding to that of the fluorescence emission. Such resonances exists also for cylindrical fibers (Owen JF et al 1982) both in fluorescence and Raman scattering.

Benner RE et al 1980 also observed such resonances in fluorescence spectra of spheres deposited on a surface, later examined in detail by Hill SC et al 1984b. As found by Hill et al the positions and magnitudes of these resonances observed when the spheres rested in a medium on a dielectric (glass) surface were comparable to those of resonances for equally-sized spheres freely floating in suspension in the same medium. For a metal surface (silver), resonance positions were not modified either but the magnitudes of resonances corresponding to the sphere modes with the electric field perpendicular to the sphere surface (TM modes), were greatly reduced. This was attributed by Hill et al to the energy transfer by these resonances to surface plasmons in the metal substrate.

CITATION: Jonasz M. 2006. Mie theory: Fluorescence emission resonances (www.tpdsci.com/Tpc/MieOptResFlrs.php). In: Top. Part. Disp. Sci. (www.tpdsci.com).

HISTORY: Published: 21-Mar-2006 Modified: 21-Feb-2007 Peer-reviewed: PENDING

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