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|Title:||Two- and three-photon absorption of semiconductor quantum dots in the vicinity of half of lowest exciton energy|
|Source:||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|
|Appears in Collections:||Staff Publications|
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