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Proceedings Paper

Microdroplet missing-resonance spectroscopy
Author(s): Jay D. Eversole; Horn-Bond Lin; Anthony J. Campillo
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Paper Abstract

Light can be trapped inside droplets by total internal reflection, and resonant conditions are known to exist for particular values of the radiation wavelength, droplet size, and refractive index. Such resonances have been observed previously in fluorescence from dye-doped droplets, and their presence or absence is controlled by the amount of droplet absorption at the resonance wavelength. These resonance peaks can be regarded as very sensitive absorption indicators, providing both quantitative and spectral information. Recent efforts have shown that the relative strength of resonance peaks in fluorescent emission can be modeled to give excellent agreement with known concentrations of rhodamine dye dissolved in ethanol droplets both for self-absorption and for absorption due to nigrosin additive, with sensitivities approaching 0.001 cm-1. Using the model developed from these experiments, additional work with bromo-cresol green dye additives shows diagnostic application of the 'missing resonance spectroscopy' could provide new experimental information as a droplet concentration or pH sensor.

Paper Details

Date Published: 24 May 1993
PDF: 9 pages
Proc. SPIE 1862, Laser Applications in Combustion and Combustion Diagnostics, (24 May 1993); doi: 10.1117/12.145697
Show Author Affiliations
Jay D. Eversole, Potomac Photonics, Inc. (United States)
Horn-Bond Lin, Naval Research Lab. (United States)
Anthony J. Campillo, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 1862:
Laser Applications in Combustion and Combustion Diagnostics
Larry C. Liou, Editor(s)

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