SUBPICOSECOND TIME RESPONSE OF 3RD-ORDER OPTICAL NONLINEARITY OF SMALL COPPER PARTICLES IN GLASS

Authors
TOKIZAKI T NAKAMURA A KANEKO S UCHIDA K OMI S TANJI H ASAHARA Y
Citation
T. Tokizaki et al., SUBPICOSECOND TIME RESPONSE OF 3RD-ORDER OPTICAL NONLINEARITY OF SMALL COPPER PARTICLES IN GLASS, Applied physics letters, 65(8), 1994, pp. 941-943
Citations number
10
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
65
Issue
8
Year of publication
1994
Pages
941 - 943
Database
ISI
SICI code
0003-6951(1994)65:8<941:STRO3O>2.0.ZU;2-T
Abstract
Femtosecond pump-probe experiments with a time resolution of 100 fs ha ve been performed for copper particles with a radius of 4 nm. Differen tial absorption spectra for a pump centered at 2.05 eV indicates the b roadening of the absorption band due to the surface plasmon. The nonli near response time derived from the recovery time of the nonlinear abs orption is dependent on the pumping laser fluences, and is as short as 0.7 ps for 210 muJ/cm2. The relaxation dynamics of nonequilibrium ele ctrons can be described by the usual electron-phonon coupling model.