Non-linear optical properties of zinc oxide nanowires |
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Authors: | Tang C F Deng H Tang B Cheng H Wang J C Chen J J |
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Affiliation: | School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China. |
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Abstract: | 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/cm2 and a sharp peak about 0.5 nm wide emerged when the energy intensity reached 700 mJ/cm2. We attribute this excitation process to a two-photon absorption process enhanced by Rabi oscillation. |
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