Study on Spectroscopy and Third-Order Optical Nonlinear Characteristics of Ag-Nanoparticles Embedded Bismuthate Glass
CHENG Jun-wen1,3, CHEN Fei-fei1,3, DAI Shi-xun1,3*, XU Yin-sheng2,3, TAN Rui-qin1,3
1. Faculty of Information Science and Engineering, Ningbo University, Ningbo 315211, China 2. Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China 3. Laboratory of Infrared Materials and Devices, Ningbo University, Ningbo 315211, China
Abstract：In the present paper, Ag nanoparticles embedded bismuthate glass composite was prepared by using a novel thermo-chemical reduction method. Red shift of surface plasmon resonance (SPR) absorption of the Ag nanoparticles was observed by utilizing UV-visible absorption spectra. The Raman spectra evidenced the evolution of the structural units of the glass after introduction of Ag nanoparticles. Z-scan and optical Kerr shutter technique with femtosecond laser as excitation source was applied to investigate the third-order optical nonlinearities of the nanocomposite in near-infrared region. The results show that the silver-bismuthate nanocomposite possesses Kerr response in scale of sub-picosecond, and its nonlinear refraction γ was dramatically increased up to 29 times under the influences of hot electron effect and local field effect.
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