1Department of Physics, Fudan University, Shanghai 2004332State Key Lab for Surface Physics, Fudan University, Shanghai 2004333School of Microelectronics, State Key Lab of ASIC and Systems, Fudan University, Shanghai 2004334Department of Optical Science and Engineering, Fudan University, Shanghai 200433
Femtosecond Third-Order Optical Nonlinearity of Au:Bi2O3 Nanocomposite Films
1Department of Physics, Fudan University, Shanghai 2004332State Key Lab for Surface Physics, Fudan University, Shanghai 2004333School of Microelectronics, State Key Lab of ASIC and Systems, Fudan University, Shanghai 2004334Department of Optical Science and Engineering, Fudan University, Shanghai 200433
摘要Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au:Bi2O3 nanocomposite films deposited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect (OKE) and pump--probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6×10-10 esu and 1.8×10-9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump--probe measurement.
Abstract：Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au:Bi2O3 nanocomposite films deposited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect (OKE) and pump--probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6×10-10 esu and 1.8×10-9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump--probe measurement.
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