TITLE

Optical nonlinearity of monodispersed, capped ZnS quantum particles

AUTHOR(S)
Nikesh, V. V.; Dharmadhikari, Aditya; Ono, Hiroshi; Nozaki, Shinji; Kumar, G. Ravindra; Mahamuni, Shailaja
PUB. DATE
June 2004
SOURCE
Applied Physics Letters;6/7/2004, Vol. 84 Issue 23, p4602
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
ZnS quantum dots are synthesized by a high-temperature chemical route with narrow size distribution at diameters of 1.4 and 1.8 nm. Significantly small size dispersion of 1.4-nm-sized ZnS quantum dots is vivid from the transmission electron microscopic measurements. The nonlinear absorption is measured at wavelengths 532 and 520 nm using a picosecond laser in an open aperture z-scan setup. The measured two-photon absorption coefficients are 0.08 and 0.2 cm/GW for smaller and larger nanoparticles. Two photon absorption cross sections for nanoparticles are about six orders of magnitude larger than bulk ZnS. © 2004 American Institute of Physics.
ACCESSION #
13203752

 

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