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http://purl.org/purl/2046
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Title: | Nonlinear optical characteristics of self-assembled films of ZnO |
Authors: | Litty, Irimpan Deepthy, A Bindu, Krishnan Nampoori, V P N Radhakrishnan, P Technology |
Keywords: | Nonlinear optical properties Self-assembled films Photonics ZnO |
Issue Date: | 2008 |
Publisher: | Springer |
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 |
Appears in Collections: | Dr. V P N Nampoori
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