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Blackbody emission under laser excitation of silicon nanopowder produced by plasma-enhanced chemical-vapor deposition

Previous results concerning radiative emission under laser irradiation of silicon nanopowder are reinterpreted in terms of thermal emission. A model is developed that considers the particles in the powder as independent, so under vacuum the only dissipation mechanism is thermal radiation. The supralinear dependence observed between the intensity of the emitted radiation and laser power is predicted by the model, as is the exponential quenching when the gas pressure around the sample increases. The analysis allows us to determine the sample temperature. The local heating of the sample has been assessed independently by the position of the transverse optical Raman mode. Finally, it is suggested that the photoluminescence observed in porous silicon and similar materials could, in some cases, be blackbody radiation

American Institute of Physics

Author: Costa i Balanzat, Josep
Roura Grabulosa, Pere
Morante i Lleonart, Joan R.
Bertrán Serra, Enric
Abstract: Previous results concerning radiative emission under laser irradiation of silicon nanopowder are reinterpreted in terms of thermal emission. A model is developed that considers the particles in the powder as independent, so under vacuum the only dissipation mechanism is thermal radiation. The supralinear dependence observed between the intensity of the emitted radiation and laser power is predicted by the model, as is the exponential quenching when the gas pressure around the sample increases. The analysis allows us to determine the sample temperature. The local heating of the sample has been assessed independently by the position of the transverse optical Raman mode. Finally, it is suggested that the photoluminescence observed in porous silicon and similar materials could, in some cases, be blackbody radiation
Document access: http://hdl.handle.net/2072/94946
Language: eng
Publisher: American Institute of Physics
Rights: Tots els drets reservats
Subject: Espectroscòpia de Raman
Fotoluminescència
Semiconductors
Silici
Photoluminescence
Raman spectroscopy
Silicon
Title: Blackbody emission under laser excitation of silicon nanopowder produced by plasma-enhanced chemical-vapor deposition
Type: info:eu-repo/semantics/article
Repository: Recercat

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