Nonlinear optical characteristics of self-assembled films of ZnO

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Nonlinear optical characteristics of self-assembled films of ZnO

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Title: Nonlinear optical characteristics of self-assembled films of ZnO
Author: Litty, Irimpan; Deepthy, A; Bindu, Krishnan; V P N Nampoori; Radhakrishnan, P
Abstract: In the present work, we have investigated the nonlinear optical properties of self-assembled films formed from ZnO colloidal spheres by z-scan technique. The sign of the nonlinear component of refractive index of the material remains the same; however, a switching from reverse saturable absorption to saturable absorption has been observed as the material changes from colloid to self-assembled film. These different nonlinear characteristics can be mainly attributed to ZnO defect states and electronic effects when the colloidal solution is transformed into self-assembled monolayers. We investigated the intensity, wavelength and size dependence of saturable and reverse saturable absorption of ZnO self-assembled films and colloids. Values of the imaginary part of third-order susceptibility are calculated for particles of size in the range 20–300 nm at different intensity levels ranging from 40 to 325MW/cm2 within the wavelength range of 450–650 nm.
URI: http://dyuthi.cusat.ac.in/xmlui/purl/2046
Date: 2008


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