基于近零折射率异质结构的XUV等离激元波导
XUV plasmonic waveguides by near-zero index heterostructures
AI总结：
本文提出基于钛-铝-钛近零折射率异质结构实现XUV辐射导引的理论方法，通过调控铝厚度可实现纳米级限制与微米级传播，并在零折射率波长处获得三阶非线性增强。
摘要：
极紫外（XUV）波段缺乏透射型光子组件，构成了微/纳米尺度限制的挑战。在此，我们从理论上设计了一种新方法，基于钛-铝-钛异质结构在该光谱域的电磁特性来实现XUV辐射导引。我们表明，得益于铝和钛的近零折射率特性，XUV辐射能够与该异质结构中的等离子体振荡高效耦合，从而激发出几种不同的等离激元极化激元模式。我们基于全矢量Maxwell方程组的半解析解预测，等离激元极化激元模式的色散分布可以通过铝的厚度进行有效调制，从而实现纳米级限制和微米级传播长度。此外，我们量化了三阶非线性增强因子，发现其在零折射率波长处发生共振。我们的结果对于开发未来实现XUV辐射高级控制与操纵的器件具有广阔前景。
英文摘要：
The lack of transmissive photonic components in the extreme ultra-violet (XUV) constitutes a challenge for micro/nano-metric confinement. Here, we theoretically design a novel approach to attain XUV radiation guidance based on the electromagnetic properties of Titanium-Aluminum-Titanium heterostructures in such a spectral domain. We show that, thanks to the near-zero-index properties of aluminum and titanium, XUV radiation can couple efficiently with plasma oscillations in such heterostructures, enabling the excitation of several distinct plasmon polariton modes. Our predictions, based on the semi-analytical solution of fully vectorial Maxwell's equations, indicate that the dispersion profile of plasmon polariton modes can get efficiently modulated by the aluminum thickness, enabling nanometre confinement and micrometre propagation length. Moreover, we quantify the third-order nonlinearity enhancement factor, finding that it is resonant at the zero-index wavelength. Our results are promising for the development of future devices enabling advanced control and manipulation of XUV radiation.
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