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Structural, morphological, linear and third order nonlinear optical study of Al2O3 doped PVA composite thin films

M. S. KUMARAVEL1, P. SANGEETHA2, N. ALAGUMURTHY1, P. MATHIYALAGAN33, G. MURALI4, S. JEYARAM5,*

Affiliation

  1. Department of Mechanical Engineering, Pondicherry Technological University, Pillaichavady, Puducherry-605 014. Indi
  2. Department of Physics, Panimalar Engineering College, Chennai-600123, Tamilnadu, India
  3. Department of Mechanical Engineering, J.J. Engineering College, and Technology, Tiruchirappall-620009, Tamilnadu, India
  4. Nanotechnology Research Centre, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur-603203, Tamilnadu, India
  5. Department of Physics, Takshashila University, Ongur (PO), Tindivanam (TK), Villupuram-604305, Tamilnadu, India

Abstract

Aluminium Oxide (Al2O3) doped poly vinyl alcohol (PVA) composite thin films on silica glass plate were prepared via casting method and their structural, morphological, linear and 3rd order nonlinear optical (NLO) properties were reported. The polymer composite thin films were fabricated with varying weight percentages (1 wt %, 2 wt %, and 3 wt %) of Al2O3. The XRD technique revealed that the sample exhibited amorphous nature. The scanning electron microscopy (SEM) study showed the morphological features of the polymer composite thin films and the EDX spectrum reports the chemical configuration of the film. The 3rd order NLO study was carried out using a diode laser working at 650 nm wavelength. The composite films exhibited a negative nonlinear refractive index and nonlinear absorption coefficient due to self-defocusing and saturable absorption behaviors, respectively. The 3rd order NLO refractive index and absorption coefficient of the films were found to be the order of 10–7 cm2/W and 10–3 cm/W. It was noted that, the NLO features of the thin film was increased with increase in Al2O3 concentration. The real and imaginary components of the 3rd order NLO susceptibility were measured to be the order of 10–6 esu. The results suggest that Al2O3 doped with PVA composite thin films may be an acceptable choice for future NLO applications..

Keywords

Al2O3, PVA, NLO, Z-scan, Self-defocusing, Saturable absorption.

Submitted at: Feb. 27, 2025
Accepted at: June 2, 2026

Citation

M. S. KUMARAVEL, P. SANGEETHA, N. ALAGUMURTHY, P. MATHIYALAGAN3, G. MURALI, S. JEYARAM, Structural, morphological, linear and third order nonlinear optical study of Al2O3 doped PVA composite thin films, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 5-6, pp. 242-250 (2026)