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Updated: May 14, 2026

Optical Trap Loading of Dielectric Microparticles In Air

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

Mie scattering by a charged dielectric particle.

R L Heinisch¹, F X Bronold, H Fehske

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

Physical Review Letters

|February 2, 2013

Summary

Surplus electrons in dielectric particles shift infrared extinction resonances. This optical method can measure particle charge, enabling minimally invasive plasma probing.

Area of Science:

Condensed Matter Physics
Optical Spectroscopy
Plasma Physics

Background:

Dielectric particles exhibit anomalous light scattering due to transverse optical phonon resonances.
Excess electrons influence particle polarizability through phonon-limited conductivity.
Electron behavior depends on surface (negative electron affinity) or bulk (positive electron affinity) states.

Purpose of the Study:

To investigate the impact of surplus electrons on light scattering anomalies in dielectric particles.
To explore the relationship between electron concentration and optical resonance shifts.
To establish an optical technique for measuring particle charge in plasma environments.

Main Methods:

Theoretical analysis of dielectric function incorporating electron effects.

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Modeling of light scattering phenomena influenced by phonon-limited conductivity.

Infrared spectroscopy to observe extinction resonance shifts.

Main Results:

Surplus electrons cause a measurable shift in the extinction resonance frequency.
The magnitude of the shift correlates with the number of excess electrons.
This effect is observable for both surface and bulk electron accumulation.

Conclusions:

Optical resonance shifts provide a sensitive method for quantifying excess electrons in dielectric particles.
This technique offers a non-invasive approach to measure particle charge in plasmas.
Potential applications include advanced plasma diagnostics and material characterization.