Mie scattering by a charged dielectric particle

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 constant. Excess electrons affect the polarizability of the particle by their phonon-limited conductivity, either in a surface layer (for negative electron affinity) or the conduction band (for positive electron affinity). We demonstrate that surplus electrons shift an extinction resonance in the infrared. This offers an optical way to measure the charge of the particle and thus to use it in a plasma as a minimally invasive electric probe.

5 pages, 5 figures, accepted manuscript

References in corpus (2)

• Electron surface layer at the interface of a plasma and a dielectric wall
• Physisorption of an electron in deep surface potentials off a dielectric surface

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