INVESTIGATING NON-INCANDESCENCE EMISSION DURING LASER INDUCED INCANDESCENCE EXPERIMENTS ON AEROSOLIZED PLASMONIC NANOPARTICLES

S.  Talebi-Moghaddam; Stephen Robinson-Enebeli; Timothy A.  Sipkens; A.  Klinkova; Kyle J.  Daun

doi:10.1615/RAD-19.190

Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19

June, 3-7, 2019, Athens, Greece

DOI: 10.1615/RAD-19

ISBN: 978-1-56700-479-3

ISSN: 2642-5629

INVESTIGATING NON-INCANDESCENCE EMISSION DURING LASER INDUCED INCANDESCENCE EXPERIMENTS ON AEROSOLIZED PLASMONIC NANOPARTICLES

pages 153-161

DOI: 10.1615/RAD-19.190

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S. Talebi-Moghaddam
University of Waterloo, 200 University Ave. W., Waterloo, ON, Canada

Stephen Robinson-Enebeli
Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave W, Waterloo, ON, Canada; EMPI, Institute for Energy and Materials Processes – Reactive Fluids, and CENIDE, Center for Nanointegration Duisburg Essen, University of Duisburg-Essen, 47048, Duisburg, Germany

Timothy A. Sipkens
Department of Mechanical and Mechatronics Engineering, University of Waterloo 200 University Ave. W, Waterloo, ON, N2L 3G1, Canada

A. Klinkova
University of Waterloo, 200 University Ave. W., Waterloo, ON, Canada

Kyle J. Daun
Department of Mechanical and Mechatronics Engineering, University of Waterloo 200 University Ave. W, Waterloo, ON, N2L 3G1, Canada

SINOPSIS

Time-resolved laser-induced incandescence (TiRe-LII) experiments conducted on aerosolized Ag, commercial soot and Au nanoparticles energized with a 1064 nm laser pulse. Detected TiRe-LII signal from aerosolized Ag nanoparticles suggest that the observed signal could originate from electron neutral bremsstrahlung and not of incandescence origin. A new model is proposed based on plasmonically-enhanced photoemission of electrons from Ag nanoparticles. The interaction of the electrons with buffer gas neutral species leads to inverse neutral bremsstrahlung absorption of the laser pulse as well as neutral bremsstrahlung emission. The new model could potentially explain some of the anomalies observed during TiRe-LII experiments as a secondary signal contaminating the original incandescence signal.

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