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Self-limited underdense microplasmas in bulk silicon induced by ultrashort laser pulses.
- Source :
-
Applied Physics Letters . 11/10/2014, Vol. 105 Issue 19, p1-4. 4p. 1 Diagram, 4 Graphs. - Publication Year :
- 2014
-
Abstract
- Two-photon ionization by focused femtosecond laser pulses initiates the development of micrometer-scale plasmas in the bulk of silicon. Using pump-and-probe transmission microscopy with infrared light, we investigate the space-time characteristics of these plasmas for laser intensities up to 101 2W/cm2 . The measurements reveal a self-limitation of the excitation at a maximum free-carrier density of ffi1019cm~3, which is more than one order of magnitude below the threshold for permanent modification. The plasmas remain unchanged in the --100 ps timescale revealing slow carrier kinetics. The results underline the limits in local control of silicon dielectric permittivity, which are inherent to the use of single near-infrared ultrashort Gaussian pulses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 105
- Issue :
- 19
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 99538676
- Full Text :
- https://doi.org/10.1063/1.4901528