Ghost Waves in Anisotropic Materials: negative refractive index and evanescent field enhancement in lossless media
Ghost Waves in Anisotropic Materials: negative refractive index and evanescent field enhancement in lossless media
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各向异性材料中的鬼波：无损介质中的负折射率和渐逝场增强
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发表时间：
2017
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通讯作者：
E. Narimanov
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作者：
E. Narimanov
我们表明，具有强光学各向异性的透明介质支持一类新的电磁波，该电磁波联合收割机结合了传播场和倏逝场的性质。这些“鬼波”是在切线分叉中产生的，它“湮灭”了正负折射率模式对，代表了不可积动力系统量子理论中“鬼轨道”的光学模拟。类似于规则的倏逝场，鬼波支持高的横向波数，但除了指数衰减显示在传播方向上的振荡行为。鬼波可以与入射的倏逝波共振耦合，然后通过各向异性介质以指数方式增长-就像负折射率材料的情况一样。由于鬼波由透明电介质支持，因此它们没有传统负折射率复合材料固有的材料损耗“诅咒”。
We show that transparent dielectrics with strong optical anisotropy support a new class of electromagnetic waves that combine the properties of propagating and evanescent fields. These "ghost waves" are created in tangent bifurcations that "annihilate" pairs of positive- and negative-index modes, and represent the optical analogue of the "ghost orbits" in the quantum theory of non-integrable dynamical systems. Similarly to the regular evanescent fields, ghost waves support high transverse wavenumbers, but in addition to the exponential decay show oscillatory behavior in the direction of propagation. Ghost waves can be resonantly coupled to the incident evanescent waves, which then grow exponentially through the anisotropic media - as in the case of negative index materials.As ghost waves are supported by transparent dielectric media, they are free from the "curse" of material loss that is inherent to conventional negative index composites.