Crossover from non-thermal to thermal photoluminescence from metals excited by ultrashort light pulses
Photoluminescence from metal nanostructures following intense ultrashort illumination is a fundamental aspect of light-matter interactions. Surprisingly, many of its basic characteristics are under ongoing debate. Here, we resolve many of these debates by providing a comprehensive theoretical framew...
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Main Authors | , , , , , |
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Format | Journal Article |
Language | English |
Published |
15.02.2023
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Subjects | |
Online Access | Get full text |
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Summary: | Photoluminescence from metal nanostructures following intense ultrashort
illumination is a fundamental aspect of light-matter interactions.
Surprisingly, many of its basic characteristics are under ongoing debate. Here,
we resolve many of these debates by providing a comprehensive theoretical
framework that describes this phenomenon, and support it by experimental
confirmation. Specifically, we identify aspects of the emission that are
characteristic to either non-thermal or thermal emission, in particular,
differences in the spectral and electric field-dependence of these two
contributions to the emission. Overall, non-thermal emission is characteristic
of the early stages of light emission, while the later stages show thermal
characteristics. The former dominate only for moderately high illumination
intensities for which the electron temperature reached after thermalization
remains close to room temperature. The theory is complemented by experimental
evidence that demonstrates the novel aspects of our considerations. |
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DOI: | 10.48550/arxiv.2302.08333 |