Linear and nonlinear optical properties of luminescent ZnO nanoparticles embedded in PMMA matrix

ZnO nanoparticles embedded in the PMMA matrix were prepared by wet chemical synthesis. The optical band gap of the ZnO nanoparticles decreases with increase in NaOH concentration. The photoluminescence spectra of the ZnO colloids show strong UV, green and blue emissions. The optical absorptive nonli...

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Bibliographic Details
Published in:Optics communications 2010-07, Vol.283 (14), p.2908-2913
Main Authors: Sreeja, R., John, Jobina, Aneesh, P.M., Jayaraj, M.K.
Format: Article
Language:English
Subjects:
Apertures
Beam trapping, self-focusing and defocusing
self-phase modulation
Constraining
Devices
Dispersion
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nanoparticles
Nonlinear optics
Nonlinearity
Optical susceptibility, hyperpolarizability
Optics
Physics
Polymethyl methacrylates
Zinc oxide
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Summary:ZnO nanoparticles embedded in the PMMA matrix were prepared by wet chemical synthesis. The optical band gap of the ZnO nanoparticles decreases with increase in NaOH concentration. The photoluminescence spectra of the ZnO colloids show strong UV, green and blue emissions. The optical absorptive nonlinearity of the ZnO:PMMA composites was analyzed using an open aperture Z-scan technique which shows optical limiting type nonlinearity due to the two photon absorption in ZnO. The efficiency of limiting is found to increase with decrease in the band gap. ZnO:PMMA shows a negative value for nonlinear refractive index n 2 and the magnitude of n 2 increases with decrease of band gap. Stability as well as the mechanical properties of the nanoparticles embedded in the PMMA matrix makes it more suitable for device fabrication as compared to the ZnO nanoparticles dispersed in solution.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2010.02.044