Anisotropic third-order optical nonlinearity of a single ZnO micro/nanowire.
Anisotropic third-order optical nonlinearity of a single ZnO micro/nanowire.
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DOI：
10.1021/nl203884j
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发表时间：
2012-01
期刊：
影响因子：
10.8
通讯作者：
Kai Wang;Jun Zhou;Longyan Yuan;Y. Tao;Jian Chen;P. Lu;Zhong Lin Wang
中科院分区：
文献类型：
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作者：
Kai Wang;Jun Zhou;Longyan Yuan;Y. Tao;Jian Chen;P. Lu;Zhong Lin Wang
本文利用飞秒激光的z扫描方法，系统地研究了ZnO微纳米线的各向异性三阶光学非线性。双光子吸收系数和非线性折射率随极化角和样品取向角的变化呈现出周期为π/2的振荡曲线，表明ZnO微纳米线具有高度偏振光学非线性。进一步的研究表明，ZnO微纳米线的偏振光学非线性高度依赖于尺寸。结果表明，ZnO纳米线在纳米激光器、全光开关和偏振敏感光电探测器等方面具有很大的应用潜力。
We report a systematic study about the anisotropic third-order optical nonlinearity of a single ZnO micro/nanowire by using the Z-scan method with a femtosecond laser. The two-photon absorption coefficient and nonlinear refraction index, which are measured as a function of polarization angle and sample orientation angle, exhibit oscillation curves with a period of π/2, indicating a highly polarized optical nonlinearity of the ZnO micro/nanowire. Further studies show that the polarized optical nonlinearity of the ZnO micro/nanowire is highly size-dependent. The results indicate that ZnO nanowire has great potential in applications of nanolasers, all-optical switching and polarization-sensitive photodetectors.