Title:	Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots
Authors:	Ann Mary, K.A. Unnikrishnan, N.V. Philip, Reji
Issue Date:	Jul-2014
Publisher:	American Institute of Physics
Citation:	APL Materials, 2014, Vol 2, 076104
Abstract:	We report facile preparation of water dispersible CuS quantum dots (2–4 nm) and nanoparticles (5–11 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.
Description:	Open Access
URI:	http://hdl.handle.net/2289/5989
ISSN:	2166-532X
Alternative Location:	http://dx.doi.org/10.1063/1.4886276
Copyright:	2014 Authors licensed under Creative Commons Attribution 3.0
Appears in Collections:	Research Papers (LAMP)

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