Title:	Defects related emission and nanosecond optical power limiting in CuS quantum dots
Authors:	Ann Mary, K.A. Unnikrishnan, N.V. Philip, Reji
Keywords:	Optical nonlinearity Surface states
Issue Date:	Nov-2015
Publisher:	Elsevier B.V.
Citation:	Physica E: Low-dimensional Systems and Nanostructures, 2015, Vol. 74, p151-155
Abstract:	We report optical and nonlinear optical properties of CuS quantum dots and nanoparticles prepared through a nontoxic, green, one-pot synthesis method. The presence of surface states and defects in the quantum dots are evident from the luminescent behavior and enhanced nonlinear optical properties measured using the open aperture Z-scan, employing 5 ns laser pulses at 532 nm. The quantum dots exhibit large effective third order nonlinear optical coefficients with a relatively lower optical limiting threshold of 2.3 J cm−2, and the optical nonlinearity arises largely from absorption saturation and excited state absorption. Results suggest that these materials are potential candidates for designing efficient optical limiters with applications in laser safety devices.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/6381
ISSN:	1386-9477
Alternative Location:	http://dx.doi.org/10.1016/j.physe.2015.06.031
Copyright:	2015 Elsevier B.V.
Appears in Collections:	Research Papers (LAMP)

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