Reduced damping of surface plasmons at low temperatures

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https://doi.org/10.1103/PhysRevB.79.035418
 http://hdl.handle.net/11603/29202

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UMBC Physics Department

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https://orcid.org/0000-0002-6370-8765

Date

2009-01-27

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journal articles
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Liu, Mingzhao, Matthew Pelton, and Philippe Guyot-Sionnest. “Reduced Damping of Surface Plasmons at Low Temperatures.” Physical Review B 79, no. 3 (January 27, 2009): 035418. https://doi.org/10.1103/PhysRevB.79.035418.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

We investigated the effectiveness of low temperatures in reducing plasmon damping by measuring the homogeneous linewidth of plasmon resonances (∼1.5 eV) in nanoscale gold bipyramids at temperatures from 293 to 6 K. The linewidth drops linearly with temperature and approaches a constant value at approximately 50 K. Measurements were performed on monodisperse ensembles as well as on single particles. The 30% decrease in the homogeneous linewidth with decreasing temperature is well accounted for by the reduced electron-phonon scattering. The other relaxation mechanisms—electron-electron scattering, electron-surface scattering, and radiative relaxation—do not change significantly with temperature.