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Appl. Sci. 2017, 7(12), 1315; https://doi.org/10.3390/app7121315

Plasmon Modulation Spectroscopy of Noble Metals to Reveal the Distribution of the Fermi Surface Electrons in the Conduction Band

1
Department of Physics, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
2
Centre for Advanced Nanotechnology, University of Toronto, 170 College Street, Toronto, ON M5S 3E3, Canada
3
Department of Electronics and Information Technology, Faculty of Science and Technology, Hirosaki University, 3 Bunkyo-Cho, Hirosaki, Aomori 036-8561, Japan
4
Department of Applied Physics and Chemistry, and Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585 Japan
*
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 14 December 2017 / Accepted: 15 December 2017 / Published: 18 December 2017
(This article belongs to the Special Issue Laser Interaction with Plasmonic Nanostructures)
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Abstract

To directly access the dynamics of electron distribution near the Fermi-surface after plasmon excitation, pump-probe spectroscopy was performed by pumping plasmons on noble-metal films and probing the interband transition. Spectral change in the interband transitions is sensitive to the electron distribution near the Fermi-surface, because it involves the d valence-band to the conduction band transitions and should reflect the k-space distribution dynamics of electrons. For the continuous-wave pump and probe experiment, the plasmon modulation spectra are found to differ from both the current modulation and temperature difference spectra, possibly reflecting signatures of the plasmon wave function. For the femtosecond-pulse pump and probe experiment, the transient spectra agree well with the known spectra upon the excitation of the respective electrons resulting from plasmon relaxation, probably because the lifetime of plasmons is shorter than the pulse duration. View Full-Text
Keywords: surface plasmon; silver; gold; modulation spectroscopy; plasmon wavefunction; Fermi surface; interband transition; conduction band; k-space distribution; femtosecond pump-probe spectroscopy; plasmon modulation spectra; current modulation spectra; temperature difference spectra surface plasmon; silver; gold; modulation spectroscopy; plasmon wavefunction; Fermi surface; interband transition; conduction band; k-space distribution; femtosecond pump-probe spectroscopy; plasmon modulation spectra; current modulation spectra; temperature difference spectra
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Takagi, K.; Nair, S.V.; Saito, J.; Seto, K.; Watanabe, R.; Kobayashi, T.; Tokunaga, E. Plasmon Modulation Spectroscopy of Noble Metals to Reveal the Distribution of the Fermi Surface Electrons in the Conduction Band. Appl. Sci. 2017, 7, 1315.

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