Nonlinear optical studies of sodium borate glasses embedded with gold nanoparticles
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Optical glasses possessing large third-order optical nonlinear susceptibility and fast response times are promising materials for the development of advanced nonlinear photonic devices. In this context, gold nanoparticle (NP)-doped borate glasses were synthesized via the melt-quench method. The nonlinear optical (NLO) properties of thus prepared glasses were investigated at different wavelengths (i.e., at 532 nm using nanosecond pulses, at 750 nm, 800 nm, and 850 nm wavelengths using femtosecond, MHz pulses). At 532 nm, open aperture (OA) Z-scan signatures of gold NP-doped borate glasses demonstrated reverse saturable absorption (RSA), attributed to mixed intra-band and interband transitions, while in the 750‒850 nm region, the OA Z-scan data revealed the presence of saturable absorption (SA), possibly due to intra-band transitions. The NLO coefficients were evaluated at all the spectral regions and further compared with some of the recently reported glasses. The magnitudes of obtained NLO coefficients clearly demonstrate that the investigated glasses are potential materials for photonic device applications.
One of the authors (GJ) is grateful to Dr. Rajan V Anavekar, former Professor, Department of Physics, Bangalore University, Bangalore, for useful discussions and valuable suggestions. The authors thank Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology, Bombay, India for providing HR-TEM experimental facility. S. V. Rao thanks DRDO, India for financial support through ACRHEM. GJ would like to thank Dr. Promod Kumar, Department of Physics, University of the Free state, Bloemfontein, South Africa for useful inputs given to measure the particle size using Mie theory.
- 32.Y. Zhang, J. Zhang, Y. Jin, J. Zhang, G. Hu, S. Lin, R. Yuan, X. Liang, W. Xiang, J. Mater. Sci. Mater. Electron. 28, 1 (2017)Google Scholar