Abstract
Under the stimulation of laser pulses with a wavelength of 647 nm and a pulse duration of 150 fs, the optical transient response of Ag–BaO thin film was obtained by the pump-probe method. Optical relaxation is a process in which nonequilibrium electrons, excited by laser pulses and originating from Ag nano-scale particles, return to the equilibrium state. Its optical transient relaxation consists of a faster part and a slower one. The faster part is only 200 fs and is caused by nonequilibrium electrons entering the matrix. The slower part is 1.6 ps and is caused by nonequilibrium electrons scattering with the lattice and the interface between the Ag nano-scale particles and the matrix. From calculated results, the theoretical curve was coincident with experimental one. The thin film containing Ag nano-scale particles embedded in BaO semiconductor matrix has extremely fast photoelectron response time.
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