Tunable Nonlinear Optical Properties of Zno-Cu Nanocomposites due to the Impact of Self Assembly

Tunable Nonlinear Optical Properties of Zno-Cu Nanocomposites due to the Impact of Self Assembly
Author(s):
Dr. Litty Mathew Irimpan
Keywords:
Nanocomposites, Self-assembly, ZnO-Cu, z-scan, Saturable absorption, Reverse saturable absorption
Abstract
In the present work, we compare the nonlinear optical properties of ZnO-Cu colloid and self-assembled film by z scan technique. ZnO and Zno-Cu colloid clearly exhibit a negative nonlinear index of refraction at 532 nm and the observed nonlinear refraction is attributed to two-photon absorption followed by weak free-carrier absorption and interband absorption mechanisms. Zno-Cu colloid exhibit reverse saturable absorption whereas the self-assembled film exhibits saturable absorption. These different nonlinear characteristics in the self-assembled films can be mainly attributed to the saturation of linear absorption of the ZnO defect states. ZnO–Cu is a potential nanocomposite material for the light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.
Article Details
Unique Paper ID: 155920 Publication Volume & Issue: Volume 9, Issue 2 Page(s): 235 - 238
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