Degenerate optical nonlinear enhancement in epsilon-near-zero transparent conducting oxides
Degenerate optical nonlinear enhancement in epsilon-near-zero transparent conducting oxides
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DOI：
10.1364/ome.8.003392
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发表时间：
2018-11-01
影响因子：
2.8
通讯作者：
Ferrera, Marcello
中科院分区：
文献类型：
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作者：
Carnemolla, Enrico Giuseppe;Caspani, Lucia;Ferrera, Marcello
报道了用抽运-探测光谱技术在频率简并的情况下同时提高了氧化铝(AZO)的非线性克尔系数n(2)和三阶非线性极化率X_i((3))。我们的实验表明，三阶非线性极化率提高了6倍，非线性克尔系数增加了一个数量级以上，同时还确定了两个不同的操作波长，用于对复折射率的实部或虚部进行最佳调制。这些结果除了提供了对AZO薄膜三阶非线性的更广泛的光谱表征外，还展示了通过在ENZ波长附近简并激发来进行非线性光学的基本优点。由光学学会根据知识共享署名4.0许可证的条款出版。
We report the simultaneous increase of both nonlinear Kerr coefficient n(2) and third-order nonlinear susceptibility chi((3)) in aluminum zinc oxide (AZO) attained by pump-probe spectroscopy in a frequency degenerate configuration. Our experiments demonstrate a 6-fold enhancement in the third-order nonlinear susceptibility and over one order of magnitude increase in the nonlinear Kerr coefficient, while also determining two distinct operational wavelengths for optimal modulation of either the real or the imaginary part of the complex refractive index. These results, besides providing a broader spectral characterization of the third-order nonlinearity in AZO thin films, also show the fundamental advantages of performing nonlinear optics via degenerate excitation near the ENZ wavelength. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.