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arXiv 2007.08312physics.opticsphysics.app-ph
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ENZ材料和各向异性:增强金属/导电氧化物多层膜中纳米尺度的非线性光学相互作用

ENZ materials and Anisotropy: Enhancing Nonlinear Optical Interactions at the Nanoscale in Metal/Conducting-Oxide Multilayer Stacks

Maria Antonietta Vincenti, Domenico de Ceglia, Michael Scalora

摘要:

ε-近零材料是研究纳米尺度电动力学和非线性光学过程的特殊候选材料。我们证明,通过交替的金属和高掺杂的导电氧化物,ε-近零制度可以访问导致各向异性,复合纳米结构,显着增强非线性相互作用。使用两个独立的和不同的计算技术,我们表明,该结构可以提高近两个数量级的局部场强,在很大程度上是由于发病的有效各向异性。使用微观流体动力学方法对多层纳米结构的研究也揭示了两种竞争性贡献的作用,这两种贡献在很大程度上被忽视,但可以显着改变结构的线性和非线性响应:非局域效应,使产生的共振蓝移,和热电子非线性,其随着自由电子的有效质量作为入射功率密度的函数增加而使等离子体频率红移。最后,我们表明,即使在没有二阶体非线性,二阶非线性过程也显着增强的层状结构。

英文摘要:

Epsilon-near-zero materials are exceptional candidates for studying electrodynamics and nonlinear optical processes at the nanoscale. We demonstrate that by alternating a metal and a highly doped conducting-oxide, the epsilon-near-zero regime may be accessed resulting in an anisotropic, composite nanostructure that significantly enhances nonlinear interactions. Using two independent and different computation techniques we show that the structure can enhance the local field intensity by nearly two orders of magnitudes, in large part due to the onset of the effective anisotropy. The investigation of the multilayer nanostructure using a microscopic, hydrodynamic approach also sheds light on the roles of two competing contributions that are for the most part overlooked, but that can significantly modify linear and nonlinear responses of the structure: nonlocal effects, which blueshift the resulting resonance, and the hot electron nonlinearity, which redshifts the plasma frequency as the effective mass of free electrons increases as a function of incident power density. Finally, we show that, even in absence of second order bulk nonlinearity, second order nonlinear processes are also significantly enhanced by the layered structure.

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