Lad, Amit D. ; Prem Kiran, P. ; More, Deepak ; Kumar, G. Ravindra ; Mahamuni, Shailaja (2008) Two-photon absorption in ZnSe and ZnSe/ZnS core/shell quantum structures Applied Physics Letters, 92 (4). 043126_1-043126_3. ISSN 0003-6951
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Official URL: http://apl.aip.org/resource/1/applab/v92/i4/p04312...
Related URL: http://dx.doi.org/10.1063/1.2839400
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 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. ZnSe/ZnS QDs exhibit higher 2PA cross section compared with corresponding ZnSe QDs, indicating better passivation of the QD surface.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Nonlinear Optics; Semiconductor Quantum Dots; Two-photon Processes; Zinc Compounds |
| ID Code: | 29731 |
| Deposited On: | 23 Dec 2010 05:45 |
| Last Modified: | 17 May 2016 12:32 |
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