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- Title
Silicon as a virtual plasmonic material: Acquisition of its transient optical constants and the ultrafast surface plasmon-polariton excitation.
- Authors
Danilov, P.; Ionin, A.; Kudryashov, S.; Makarov, S.; Rudenko, A.; Saltuganov, P.; Seleznev, L.; Yurovskikh, V.; Zayarny, D.; Apostolova, T.
- Abstract
Ultrafast intense photoexcitation of a silicon surface is complementarily studied experimentally and theoretically, with its prompt optical dielectric function obtained by means of time-resolved optical reflection microscopy and the underlying electron-hole plasma dynamics modeled numerically, using a quantum kinetic approach. The corresponding transient surface plasmon-polariton (SPP) dispersion curves of the photo-excited material were simulated as a function of the electron-hole plasma density, using the derived optical dielectric function model, and directly mapped at several laser photon energies, measuring spatial periods of the corresponding SPP-mediated surface relief nanogratings. The unusual spectral dynamics of the surface plasmon resonance, initially increasing with the increase in the electron-hole plasma density but damped at high interband absorption losses induced by the high-density electron-hole plasma through instantaneous bandgap renormalization, was envisioned through the multi-color mapping.
- Subjects
SILICON; PLASMONICS; OPTICAL constants; SURFACE plasmons; POLARITONS; PHOTOEXCITATION
- Publication
Journal of Experimental & Theoretical Physics, 2015, Vol 120, Issue 6, p946
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776115050118