Optical nonlinearity of CdSe-PMMA hybrid nanocomposite investigated via Z-scan technique and semi-empirical relations |
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| Affiliation: | 1. Advanced Communication Engineering Centre (ACE), School of Computer and Communication Engineering, Universiti Malaysia Perlis, Kangar 01000, Perlis, Malaysia;2. School of Materials Engineering, Universiti Malaysia Perlis, Kangar 02600, Perlis, Malaysia;3. Nanotechnology Research Lab, Kongunadu Arts and Science College, G-N Mills, Coimbatore 641 029, Tamil Nadu, India;4. Department of Physics, PSGR Krishnammal College for Women, Coimbatore 641 004, Tamil Nadu, India;5. Electronics and Communication Engineering, Christ the King Engineering College, Coimbatore 641 104, Tamil Nadu, India;1. Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 151-744, Republic of Korea;2. Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea;1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Nantong Friendly New Materials Co., Ltd, Nantong 226000, China;3. Department of Physics and Interdisciplinary Program of Biomedical, Mechanical & Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea;1. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil;2. Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas – NCEx, Campus Arapiraca, Universidade Federal de Alagoas, 57309-005 Arapiraca, AL, Brazil;3. Grupo Física de Materiais, Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil |
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| Abstract: | CdSe-PMMA nanocomposite has been synthesized by ex-situ technique. The effect of different Ag doping concentrations on its structural and optical properties has been studied. X-ray diffraction reveals the hexagonal wurtzite structure of the polymer nanocomposites with preferential growth of the nanocrystals along (1 0 0) direction. Transmission electron micrograph shows the spherical CdSe nanoparticles embedded in polymer matrix. The nonlinear refractive index of the nanocomposites has been calculated using Tichy & Ticha semi-empirical relations and Z-scan technique. Z-scan results disclose the two photon absorption process in the hybrid nanocomposites with self focussing behaviour. With Ag doping, the nonlinearity is found to be increased up to 0.2% Ag doping concentration due to the confined effect of Surface Plasmon, Quantum confinement and thermal lensing. Above 0.2% Ag concentration, its value decreases due to the declined linear refractive index of the nanocomposites. Maximum two photon figure of merit is 76 for 0.2% Ag doped CdSe-PMMA hybrid nanocomposite. The present results accentuate the possibility of tuning the optical non-linearity of CdSe-PMMA hybrid nanocomposite by adjusting the doping concentration. |
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| Keywords: | Nonlinearity Optical properties Polymer nanocomposite Z-scan |
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