Optical nonlinearities of Au nanocluster composite fabricated by 300 keV ion implantation

✍ Scribed by Y.H. Wang; J.D. Lu; R.W. Wang; S.J. Peng; Y.L. Mao; Y.G. Cheng

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 265 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2008.04.040

✦ Synopsis

Metal nanocluster-glass composite prepared by implantation of 300 keV Au ions into silica at a dose of 1 Â10 17 ions/cm 2 has been studied. The microstructural properties of the nanoclusters are characterized by optical absorption spectra and transmission electron microscopy (TEM). Third-order nonlinear optical properties of the nanoclusters are measured at 1064 and 532 nm excitations using Z-scan technique. The nonlinear refraction index, nonlinear absorption coefficient, and the real and imaginary parts of the third-order nonlinear susceptibility are deduced. Results of the investigation of nonlinear refraction using the off-axis Z-scan configuration are presented and the mechanisms responsible for the nonlinear response are discussed. Third-order nonlinear susceptibility w (3) of this kind of sample was determined to be 1.3 Â 10 À7 esu at 532 nm and 4.3 Â 10 À8 esu at 1064 nm, respectively.