Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures
- 28 January 2008
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (4), 043126
- https://doi.org/10.1063/1.2839400
Abstract
The third order nonlinear optical properties of two different sized ZnSe and Zn Se ∕ Zn S quantum dots(QDs) are investigated. The nonlinear absorption is measured at 806 nm using Ti:sapphire 100 fs laser pulses in an open aperture Z -scan setup. Two-photon absorption (2PA) is found to be dominant in core and core shell QDs. 2PA cross section is enhanced by three orders of magnitude compared bulk ZnSe. 2PA cross section is observed to increase with reduction in QD diameter, due to strong confinement effect. Zn Se ∕ Zn S QDs exhibit higher 2PA cross section compared with corresponding ZnSeQDs, indicating better passivation of the QDsurface.This publication has 20 references indexed in Scilit:
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