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首页> 外文期刊>Physical review >Enhanced lens by ε and μ near-zero metamaterial boosted by extraordinary optical transmission
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Enhanced lens by ε and μ near-zero metamaterial boosted by extraordinary optical transmission

机译：非凡的光学传输增强了ε和μ近零超材料的增强透镜

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摘要

In this paper we report directivity enhancement by a short-focal-length plano-concave lens engineered by stacked subwavelength hole arrays (fishnet-like stack) with an effective negative index of refraction close to zero, n → 0, that arises from e and μ near-zero extreme values. The plano-concave lens frequency response shows two enhancement peaks, one at the wavelength corresponding to n = - 1 and, prominent in this configuration, another unexpected peak when n → 0 that comes as a result of the similar low values of ε and μ. The frequency-dependent negative refractive index and beam-forming properties of the lens are supported by finite-integration-frequency -and time-domain simulations and experimental results. This near-zero metamaterial lens can find applications in terahertz and even optics since the building block, stacked extraordinary optical transmission layers, has already been reported for those regimes under the name of fishnet structure.
机译：在本文中，我们报道了由短焦距平凹透镜增强的方向性，该透镜由堆叠的亚波长孔阵列（鱼网状堆叠）设计而成，其有效负折射率接近零，n→0，这是由e和e引起的。 μ接近零的极值。平凹透镜的频率响应显示出两个增强峰，一个在对应于n =-1的波长处，并且在此配置中突出显示，当n→0时出现另一个意外峰，这是由于ε和μ值较低而导致的。 。透镜的随频率变化的负折射率和光束形成特性得到了有限积分频率和时域仿真以及实验结果的支持。这种近零的超材料透镜可以在太赫兹甚至光学器件中找到应用，因​​为已经报道了以鱼网结构为名的用于这些体系的构造块，堆叠的非凡光学传输层。

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