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Phys Rev Lett. 2012 Dec 14;109(24):243903. Epub 2012 Dec 10.

Mie scattering by a charged dielectric particle.

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  • 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17489 Greifswald, Germany.

Abstract

We study for a dielectric particle the effect of surplus electrons on the anomalous scattering of light arising from the transverse optical phonon resonance in the particle's dielectric function. Excess electrons affect the polarizability of the particle by their phonon-limited conductivity, either in a surface layer (negative electron affinity) or the conduction band (positive electron affinity). We show that surplus electrons shift an extinction resonance in the infrared. This offers an optical way to measure the charge of the particle and to use it in a plasma as a minimally invasive electric probe.

PMID:
23368320
DOI:
10.1103/PhysRevLett.109.243903
[PubMed]
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