Optical nonlinearity of monodispersed, capped ZnS quantum particles

Nikesh, V. V. ; Dharmadhikari, Aditya ; Ono, Hiroshi ; Nozaki, Shinji ; Kumar, G. Ravindra ; Mahamuni, Shailaja (2004) Optical nonlinearity of monodispersed, capped ZnS quantum particles Applied Physics Letters, 84 (23). pp. 4602-4604. ISSN 0003-6951

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Related URL: http://dx.doi.org/10.1063/1.1748840


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.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:29722
Deposited On:23 Dec 2010 04:59
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