Subpicosecond time response of third-order optical nonlinearity of small copper particles in glass
T. TokizakiDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanArao NakamuraDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanShoji KanekoDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanK. UchidaDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanShigeyuki OmiDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanHiroaki TanjiDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, JapanYoshiyuki AsaharaDepartment of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-01, Japan
1994en
ABI
Аннотация
Femtosecond pump-probe experiments with a time resolution of 100 fs have been performed for copper particles with a radius of 4 nm. Differential absorption spectra for a pump centered at 2.05 eV indicates the broadening of the absorption band due to the surface plasmon. The nonlinear response time derived from the recovery time of the nonlinear absorption is dependent on the pumping laser fluences, and is as short as 0.7 ps for 210 μJ/cm2. The relaxation dynamics of nonequilibrium electrons can be described by the usual electron-phonon coupling model.
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