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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 |
Appears in Collections: | Staff Publications |
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