ε近零材料中的可逆光学非线性
Invertible Optical Nonlinearity in Epsilon-near-zero Materials
摘要：
最近，诸如氧化铟锡（ITO）的ε近零（ENZ）材料已经成为增强光学非线性的新平台。在这里，我们报告了一个理论和实验研究的ITO薄膜的非线性的起源是由两种机制的基础上带内和带间跃迁。我们发现，有两个相互竞争的因素，共同贡献的光谱可逆的非线性ITO附近的ENZ区域，即非抛物线的能带结构，导致在一个更大的有效质量的带内跃迁和费米能移，这决定了自由载流子密度。我们的工作揭示了大的非线性和ITO薄膜的本征材料特性之间的关系。
英文摘要：
Epsilon-near-zero (ENZ) materials such as indium tin oxide (ITO), have recently emerged as a new platform to enhance optical nonlinearities. Here we report a theoretical and experimental study on the origin of nonlinearities in ITO thin films that are dominated by two mechanisms based on intraband and interband transitions. We show that there are two competing factors that jointly contribute to a spectrally-invertible nonlinearity of ITO near its ENZ region i.e. the non-parabolicity of the band structure that results in a larger effective mass in the intraband transition and the Fermi energy shift, which determines the free carrier density. Our work reveals the relationship between the large nonlinearity and the intrinsic material properties of the ITO films.
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