Tang, C. F. and Deng, H and Tang, B and Cheng, H and Wang, J. C. and Chen, J. J. (2008) Non-linear optical properties of zinc oxide nanowires. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8 (3). pp. 1150-1154.
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High quality zinc oxide (ZnO) nanowires were grown on n-type Si (100) using vapor-liquid-solid process. We obtained the photoluminescence spectra of ZnO nanowires based on nonlinear optical process using an ultrashort wavelength femtosecond laser as a pumping source. The spectra shows the second harmonic generation phenomenon, as well as the exciton-exciton collision peak at 388 nm and the green emission peak at 515 nm caused by oxygen vacancy. A laser emission peak near 392 nm was observed when pump intensity surpassed 52 mJ/cm(2) and a sharp peak about 0.5 nm wide emerged when the energy intensity reached 700 mJ/cm(2). We attribute this excitation process to a two-photon absorption process enhanced by Rabi oscillation.
|Uncontrolled Keywords:||ZnO; nanowires; VLS; PL spectra; two-photon absorption; nonlinearity|
|Subjects:||Material Science > Nanofabrication processes and tools|
Physical Science > Photonics
|Deposited By:||Farnush Anwar|
|Deposited On:||15 Dec 2008 10:14|
|Last Modified:||19 Feb 2009 10:00|
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