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Nonlinear optical properties of electrochemically synthesized Au nanoparticles

J. W. DADGE1, M. ISLAM2, A. K. DHARMADHIKARI3, S. R. MAHAMUNI2, R. C. AIYER2,*

Affiliation

  1. Department of Physics, College of Engineering, Shivaji Nagar, Pune 411 005, India
  2. Department of Physics, University of Pune, Pune 411 007, India
  3. Atomic and Molecular Sciences Group, Tata Institute of Fundamental Research, Mumbai 400 005, India

Abstract

The second harmonic generation (SHG) in electrochemically synthesized gold nanoparticles capped in Tetraoctylammoniumbromide (TOAB), in colloidal form using nanosecond Nd: YAG laser, is reported. The effect of particles size (6, 10 and 20 nm) in different solvents on SHG is investigated. The SHG as a function of concentration, angular distribution and its polarization properties for 6 nm size in Dimethylformamide(DMF) is studied. Dependence of SHG on (R)6 is simulated, matches with the experimental results. By Hyper Rayleigh Scattering (HRS) the β (first order optical hyperpolarizability) value is found to be 2.68 x 10-19 esu for 6nm, which is an order of magnitude higher than that reported for gold particles..

Keywords

Nonlinear optics; Hyperpolarizability; Nanoparticles.

Submitted at: June 16, 2011
Accepted at: July 25, 2011

Citation

J. W. DADGE, M. ISLAM, A. K. DHARMADHIKARI, S. R. MAHAMUNI, R. C. AIYER, Nonlinear optical properties of electrochemically synthesized Au nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 7, pp. 741-747 (2011)