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Proceedings Paper

Effects of surface chemistry and shape on nonlinear absorption, scattering, and refraction of PbSe nanocrystals
Author(s): Igor L. Bolotin; Daniel J. Asunskis; Ali M. Jawaid; Yaoming Liu; Preston T. Snee; Luke Hanley
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Paper Abstract

Oleic acid capped lead sulfide (PbSe) cubes, spheres, rods and star-shaped nanocrystals with sizes ranging from 5 to 20 nm were synthesized, then subjected to a post-synthesis washing in a 1:1 ethanol/hexane solution. The relationship of third order nonlinear optical properties to nanocrystal surface chemistry as affected by this washing was analyzed using nanosecond 532 nm Z-scan. The results indicated a significant change in optical properties emerged only after the nanocrystals, regardless of shape, were washed in the ethanol/hexane mixture. The "as grown" nanocrystals displayed high emission efficiency with no nonlinear absorption, which converted to a highly-absorbing and strongly scattering media with quenching of optical emission following washing. Transmission electron microscopy showed that neither the size nor shape of the nanocrystals was changed by washing, indicating that all differences were related to changes in surface chemistry. Finally, the Z-scan of washed nanocrystals displayed a strong correlation between nonlinear scattering and nonlinear transmittance which was also not dependent upon shape. It is postulated that the washing allowed formation of deep trap states that permitted nonlinear optical absorption.

Paper Details

Date Published: 21 February 2011
PDF: 7 pages
Proc. SPIE 7935, Organic Photonic Materials and Devices XIII, 79350P (21 February 2011); doi: 10.1117/12.872760
Show Author Affiliations
Igor L. Bolotin, Univ. of Illinois at Chicago (United States)
Daniel J. Asunskis, Univ. of Illinois at Chicago (United States)
Ali M. Jawaid, Univ. of Illinois at Chicago (United States)
Yaoming Liu, Univ. of Illinois at Chicago (United States)
Preston T. Snee, Univ. of Illinois at Chicago (United States)
Luke Hanley, Univ. of Illinois at Chicago (United States)

Published in SPIE Proceedings Vol. 7935:
Organic Photonic Materials and Devices XIII
Robert L. Nelson; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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