Title:	Role of surface defects in the third order nonlinear optical properties of pristine NiO and Cr doped NiO nanostructures
Authors:	Menon, P. Soumya Kunjumon, Jibi Bansal, Manisha Nair, Sutheertha S. Beryl, C. Vinitha, G. Maity, Tuhin Abraham, Priya Mary Sajan, D. Philip, Reji
Keywords:	Reverse saturable absorption Optical limiter Z-scan Nonlinear absorption Nonlinear refraction
Issue Date:	15-Feb-2023
Publisher:	Elsevier
Citation:	Ceramics International, 2023, Vol.49,p5815
Abstract:	Pristine NiO and 2% Cr doped NiO nanostructures are successfully synthesized by the modified auto–combustion method for the determination and improvement of linear and nonlinear optical behaviours, and for identifying them as suitable materials for optical limiting applications. Vibrational and linear optical properties of both nanostructures are investigated, and structural and morphological studies are carried out using XRD, FE-SEM, and HR-TEM. From the Kubelka-Munk model, the energy band gaps for pristine and doped samples are found to be 3.52 eV and 3.44 eV, respectively. Both pristine as well as Cr-doped NiO nanostructures reveal substantial nonlinear optical behaviour at the excitation wavelength of 532 nm, arising from the presence of strong reverse saturable absorption. The third order nonlinear absorption coefficients have values of the order of 10−10 m/W and 10−6 m/W, under pulsed (5 ns) and continuous wave laser excitations, respectively. These values confirm the suitability of these nanostructures for fabricating efficient optical limiting devices for safeguarding human eyes and optical sensors from hazardous laser radiation.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/8043
ISSN:	0272-8842
Alternative Location:	https://doi.org/10.1016/j.ceramint.2022.10.301
Copyright:	2022 Elsevier
Appears in Collections:	Research Papers (LAMP)

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