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arXiv 1502.05495physics.opticscond-mat.mes-hallcond-mat.mtrl-sci
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$\mathcal{PT}$ -ε-近零介质中对称性引起的波的限制和导引

$\mathcal{PT}$-Symmetry-Induced Wave Confinement and Guiding in Epsilon-Near-Zero Metamaterials

Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi, Andrea Alù, Nader Engheta

摘要:

受宇称-时间对称概念的启发,我们证明了ε-近零超材料中增益和损耗的明智空间调制可以诱导以零衰减为特征的指数束缚界面模式的传播。具体参考双层配置,通过色散方程的分析研究和参数化,我们表明,这种波导机制可以在中等增益/损耗水平的存在下维持,并且它变得泄漏(即,辐射)低于增益/损耗阈值。此外,我们探索了一种可能的基于棒的超材料实现,基于现实的材料成分,它捕获了波导机制的基本特征,与我们的理论预测非常一致。我们的研究结果可能为光学器件和可重构纳米光子学平台的设计开辟新的可能性。

英文摘要:

Inspired by the parity-time symmetry concept, we show that a judicious spatial modulation of gain and loss in epsilon-near-zero metamaterials can induce the propagation of exponentially-bound interface modes characterized by zero attenuation. With specific reference to a bi-layer configuration, via analytical studies and parameterization of the dispersion equation, we show that this waveguiding mechanism can be sustained in the presence of moderate gain/loss levels, and it becomes leaky (i.e., radiative) below a gain/loss threshold. Moreover, we explore a possible rod-based metamaterial implementation, based on realistic material constituents, which captures the essential features of the waveguiding mechanism, in good agreement with our theoretical predictions. Our results may open up new possibilities for the design of optical devices and reconfigurable nanophotonics platforms.

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