Journal ArticleDOI
Generation of dense electron-hole plasmas in silicon
TLDR
In this paper, the authors studied the generation of dense electron-hole plasmas in silicon with intense 100-fs laser pulses by time-resolved measurements of the optical reflectivity at 625 nm.Abstract:
Generation of dense electron-hole plasmas in silicon with intense 100-fs laser pulses is studied by time-resolved measurements of the optical reflectivity at 625 nm. For fluences F between $10 {\mathrm{m}\mathrm{J}/\mathrm{c}\mathrm{m}}^{2}lFl400 {\mathrm{m}\mathrm{J}/\mathrm{c}\mathrm{m}}^{2},$ plasma generation is dominated by strong two-photon absorption, and possibly higher-order nonlinearities, which lead to very steep spatial carrier distributions. The maximum carrier densities at the sample surface are in excess of ${10}^{22} {\mathrm{cm}}^{\ensuremath{-}3},$ and therefore, the reflectivity shows a mainly Drude-like free-carrier response. Within the Drude model, limits for the optical effective mass and the damping time are determined.read more
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Graphene Plasmonics: Challenges and Opportunities
TL;DR: Graphene plasmons are rapidly emerging as a viable tool for fast electrical manipulation of light as mentioned in this paper, and the prospects for applications to electro-optical modulation, optical sensing, quantum plasmonics, light harvesting, spectral photometry, and tunable lighting at the nanoscale are further stimulated by the relatively low level of losses and high degree of spatial confinement that characterize these excitations compared with conventional plasmic materials.
Journal ArticleDOI
Graphene Plasmonics: Challenges and Opportunities
TL;DR: In this article, a general description of the plasmonic behavior of extended graphene is given, followed by analytical methods that lead to reasonably accurate estimates of both the energy and the strength of coupling to external light in graphene nanostructures.
Journal ArticleDOI
On the role of surface plasmon polaritons in the formation of laser-induced periodic surface structures upon irradiation of silicon by femtosecond-laser pulses
TL;DR: In this paper, the formation of nearly wavelength-sized laser-induced periodic surface structures (LIPSSss) on single-crystalline silicon upon irradiation with single or multiple femtosecond-laser pulses (pulse duration τ=130
Journal ArticleDOI
Modelling ultrafast laser ablation
TL;DR: In this paper, a review is devoted to the study of ultrafast laser ablation of solids and liquids, including light absorption by electrons in the skin layer, energy transfer from the skin to target interior by nonlinear electronic heat conduction, relaxation of the electron and ion temperatures, ultrafast melting, hydrodynamic expansion of heated matter accompanied by the formation of metastable states and subsequent formation of breaks in condensed matter.
Journal ArticleDOI
Femtosecond laser-induced periodic surface structures revisited: A comparative study on ZnO
TL;DR: In this paper, LiPSS with different spatial characteristics have been observed after irradiation of single-crystalline zinc oxide surfaces with multiple linearly polarized femtosecond pulses (150-200 fs, 800 nm) in air.
References
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Nonlinear optical diagnostics of laser-excited semiconductor surfaces
TL;DR: In this paper, the authors analyze the current concepts of laser beam interaction with semiconductors and the potential of using optical methods in diagnostics, which may come from optical techniques on the structure of semiconductor crystal surfaces and phase transitions.