Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

200865 citationsJournal Article

Authors

Amit D. Lad · Savitribai Phule Pune University

P. Prem Kiran · Tata Institute of Fundamental Research

Deepak More · Savitribai Phule Pune University

G. Ravindra Kumar · Tata Institute of Fundamental Research

Shailaja Mahamuni · Savitribai Phule Pune University

Abstract

The third order nonlinear optical properties of two different sized ZnSe and ZnSe∕ZnS quantum dots (QDs) are investigated. The nonlinear absorption is measured at 806nm using Ti:sapphire 100fs 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. ZnSe∕ZnS QDs exhibit higher 2PA cross section compared with corresponding ZnSe QDs, indicating better passivation of the QD surface.

Topics & Keywords

Nonlinear Optical Materials Studies Quantum Dots Synthesis And Properties Chalcogenide Semiconductor Thin Films

Publication Details

Published in: Applied Physics Letters

Volume 92, Issue 4

DOI: 10.1063/1.2839400

Field-Weighted Citation Impact: 3.88

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Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

Authors

Abstract

Topics & Keywords

Publication Details