Photonic skin-depth engineering
Photonic skin-depth engineering
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DOI：
10.1364/josab.32.001346
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发表时间：
2015-07-01
影响因子：
1.9
通讯作者：
Jacob, Zubin
中科院分区：
文献类型：
--
作者：
Jahani, Saman;Jacob, Zubin
最近，我们提出了光限制策略的范式转变，显示了放松的全内反射和光子趋肤深度工程如何能够导致没有金属的子衍射波导[Optica 1，96（2014）]。在这里，我们表明，这种极端趋肤深度（e-skid）波导可以反直觉地限制光比最好的情况下的全介质设计的高折射率硅波导包围真空。我们还建立了分析，在电介质波导中的光限制相关的品质因数从根本上绑定到包层中的波的趋肤深度，一个数量令人惊讶地忽略了电介质光子学。我们对比了e-skid波导和传统波导的基模的传播特性，表明e-skid波导中包层中的衰减常数显着较大，这是亚衍射限制的起源。我们还提出了一种方法来验证减少的光子趋肤深度在实验中使用的古斯-汉森相移的减少。最后，我们提供了一个概括我们的工作，使用的概念转换光学的光子趋肤深度工程可以解释为一个变换的倏逝波的动量。(C)2015美国光学学会
Recently, we proposed a paradigm shift in light confinement strategy showing how relaxed total internal reflection and photonic skin-depth engineering can lead to sub-diffraction waveguides without metal [Optica 1, 96 (2014)]. Here, we show that such extreme-skin-depth (e-skid) waveguides can counterintuitively confine light better than the best-case all-dielectric design of high index silicon waveguides surrounded by vacuum. We also establish analytically that figures of merit related to light confinement in dielectric waveguides are fundamentally tied to the skin depth of waves in the cladding, a quantity surprisingly overlooked in dielectric photonics. We contrast the propagation characteristics of the fundamental mode of e-skid waveguides and conventional waveguides to show that the decay constant in the cladding is dramatically larger in e-skid waveguides, which is the origin of sub-diffraction confinement. We also propose an approach to verify the reduced photonic skin depth in experiment using the decrease in the Goos -Hanschen phase shift. Finally, we provide a generalization of our work using concepts of transformation optics where the photonic skin-depth engineering can be interpreted as a transformation on the momentum of evanescent waves. (C) 2015 Optical Society of America