J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (6): 506-511.

• Thin Film and Coatings • Previous Articles     Next Articles

Effect of Surface Roughness on Laser Induced Nonlinear Optical Properties of Annealed ZnO Thin Films

Vinay Kumari1,4), Vinod Kumar2), Devendra Mohan3), Purnima3), B.P. Malik4),  R.M. Mehra5)   

  1. 1) Department of Physics, BMIET, Sonepat 131001, India
    2) Materials Science Group, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
    3) Department of Applied Physics, GJUS&T, Hisar 125001, India
    4) Department of Physics, DCRUST, Murthal 131027, India
    5) School of Engineering and Technology, Sharda University, Greater Noida 201306, India
  • Received:2011-11-24 Revised:2012-01-19 Online:2012-06-28 Published:2012-07-26
  • Contact: Vinay Kumari
  • About author:DRDO, UGC and DST for financial support under SAP and FIST program

Abstract: Variation of nonlinear optical properties with surface roughness of ZnO thin films deposited on corning glass substrates at different annealing temperature (TA) was reported. The films were characterized by X-ray diffraction (XRD), UV-Vis-NIR transmission and single beam z-scan technique using second harmonics of Nd:YAG laser. Surface morphology of the samples was investigated by atomic force microscopy (AFM). Surface roughness was found minimum (8.4 nm) for ZnO sample annealed at 450 °C. The nonlinear optical properties (NLO) were found to be dependent on surface roughness and the highest value of third order nonlinear susceptibility (χ3)=4.3×10-7 esu) was obtained for ZnO at TA 450 °C.

Key words: ZnO films, Sol-gel, Annealing temperature, Nonlinear optical properties, Third order nonlinear susceptibility, z-scan