Topics in Particle and Dispersion Science

Mie theory: Applications of optical resonances

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The form and spacing of the fine structure are very sensitive indicators of the particle size and refractive index, which makes it possible to determine properties of microspheres with a high accuracy. In particular, by fitting an observed resonance pattern of a microsphere, the refractive index and size of the microsphere can be simultaneously determined with an accuracy on the order of 1 part in 10⁵ (Chılek P et al 1983). Automated algorithms have been developed for particle sizing through fitting observed resonance patterns (Hill SC et al 1985, Conwell PR et al 1984b).

Optical resonances also allow one to conveniently study phenomena that lead to minute changes in the particle size, such as those induced by heating of a microdroplet due to absorption of light (Arnold S et al 1985). This makes possible a single-microdroplet spectroscopy. The resonances have been also used to both image single molecules located at the surface of a microsphere as well as to measure the absorption linewidths of these molecules (Norris DJ et al 1997).

CITATION: Jonasz M. 2006. Mie theory: Applications of optical resonances (www.tpdsci.com/Tpc/MieOptResApl.php). In: Top. Part. Disp. Sci. (www.tpdsci.com).

HISTORY: Published: 21-Mar-2006 Modified: 19-Jun-2006 Peer-reviewed: 24-Mar-2006

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