Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3049132
Title: Two- and three-photon absorption of semiconductor quantum dots in the vicinity of half of lowest exciton energy
Authors: Xing, G.
Ji, W. 
Zheng, Y.
Ying, J.Y.
Issue Date: 2008
Citation: Xing, G., Ji, W., Zheng, Y., Ying, J.Y. (2008). Two- and three-photon absorption of semiconductor quantum dots in the vicinity of half of lowest exciton energy. Applied Physics Letters 93 (24) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3049132
Abstract: We present a demonstration of the unambiguous determination of two-photon absorption (2PA) and three-photon absorption (3PA) in semiconductor quantum dots in the vicinity of E0 /2, where E0 denotes the peak position of the lowest exciton energy. In the spectral region where photon energies double-struk h sign ω ≥ E0 /2, the 2PA cross section is determined by open-aperture Z scans with femtosecond laser pulses at relatively lower irradiances, and then the 3PA cross section is extracted from the Z scans measured at higher irradiances. As photon energies are less than but near E0 /2, multiphoton-excited photoluminescence techniques have to be employed in conjunction with open-aperture Z scan to distinguish between 2PA and 3PA. © 2008 American Institute of Physics.
Source Title: Applied Physics Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/98469
ISSN: 00036951
DOI: 10.1063/1.3049132
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