Determination of third-order optical absorptive nonlinearity of ZnO nanoparticles by Z-scan technique

R. Sreeja; R. Reshmi; George Manu; M. K. Jayaraj

doi:10.1117/12.814575

3 October 2008 Determination of third-order optical absorptive nonlinearity of ZnO nanoparticles by Z-scan technique

R. Sreeja, R. Reshmi, George Manu, M. K. Jayaraj

Proceedings Volume 7155, Ninth International Symposium on Laser Metrology; 715521 (2008) https://doi.org/10.1117/12.814575
Event: Ninth International Symposium on Laser Metrology, 2008, Singapore, Singapore

Abstract

A sensitive single-beam technique for measuring the nonlinear absorption coefficient of ZnO nanoparticles is reported here. The transmittance T(z) of the sample is measured by open aperture Z-scan technique as the sample is moved along the propagation path(z) of a focused Gaussian laser beam. The ZnO nanoparticles synthesized by wet chemical method, by mixing zinc acetate dehydrate and NaOH in ethanol is a clear transparent colloidal solution. The average size of ZnO nanoparticles is 6nm as confirmed by TEM analysis. Two-photon absorption of colloidal solutions of ZnO nanoparticles in ethanol is investigated by the Z-scan method using the nanosecond pulses from the second harmonics of Nd:YAG laser (532nm). The value of β for ZnO dispersed in ethanol extracted from the Z-scan data are 2.1cm/GW. ZnO nanoparticles of various sizes were embedded in PVA matrix on glass substrate and size dependence on β value was analyzed. The high value of two photon absorption coefficient (β) demonstrate that ZnO nanoparticle is a potential material for optical limiting applications.

Citation Download Citation

R. Sreeja, R. Reshmi, George Manu, and M. K. Jayaraj "Determination of third-order optical absorptive nonlinearity of ZnO nanoparticles by Z-scan technique", Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 715521 (3 October 2008); https://doi.org/10.1117/12.814575

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