He, Guang S. and Zheng, Qingdong and Yong, Ken-Tye and Erogbogbo, Folarin and Swihart, Mark T. and Prasad, Paras N. (2008) Two- and three-photon absorption and frequency upconverted emission of silicon quantum dots. NANO LETTERS, 8 (9). pp. 2688-2692.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl800982z
In this communication, we present the experimental results of two- and three-photon excitation studies on silicon quantum dots (QDs) in chloroform (as well as in water) by using femtosecond laser pulses with wavelengths of 778 and 1335 nm and a pulse duration similar to 160 fs. The photoluminescence spectral distributions are nearly the same upon one-, two-, and three-photon excitation. With one- and two-photon excitation, the temporal relaxation measurements of photoluminescence emission manifest the same multiexponential decay behavior in the time range from 0.05 ns to 15 mu s, characterized by three successive decay constants: 0.75 ns, 300 ns, and 5 mu s, respectively. Finally, the two-photon absorption spectrum in the spectral range of 650-900 nm and the three-photon absorption spectrum in the spectral range of 1150-1400 nm have been measured.
|Subjects:||Physical Science > Quantum phenomena|
Physical Science > Photonics
|Deposited By:||Farnush Anwar|
|Deposited On:||23 Dec 2008 10:39|
|Last Modified:||23 Dec 2008 10:39|
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