Whispering Gallery Mode Spectroscopy as a Diagnostic for Dusty Plasmas

Whispering-gallery-mode spectroscopy is being assessed as a diagnostic method for the characterisation of size and chemical composition of spherical particles levitated in a plasma. With a pulsed laser whispering gallery modes (cavity resonances) are excited in individual microspheres leading to enh...

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Bibliographic Details
Main Authors: Thieme, G, Basner, R, Maurer, H, Ehlbeck, J, Ropcke, J, Kersten, H, Davies, P B
Format: Conference Proceeding
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ARGON IONS
DRIFT INSTABILITY
FLUORESCENCE SPECTROSCOPY
GAIN
MAGNETOHYDRODYNAMICS
MICROSPHERES
PLASMA
PLASMA DIAGNOSTICS
PLASMA WAVES
RAMAN EFFECT
RAMAN SPECTROSCOPY
RF SYSTEMS
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Summary:Whispering-gallery-mode spectroscopy is being assessed as a diagnostic method for the characterisation of size and chemical composition of spherical particles levitated in a plasma. With a pulsed laser whispering gallery modes (cavity resonances) are excited in individual microspheres leading to enhanced Raman scattering or fluorescence at characteristic wavelengths. This method can be used to gain specific information from the particle surface and is thus of great interest for the characterisation of layers deposited on microparticles, e.g. in molecular plasmas. We present investigations of different microparticles in air and results from fluorescent particles levitated in an Argon rf plasma.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2997102