Exceptional points in extraordinary optical transmission through dual subwavelength metallic gratings.
Exceptional points in extraordinary optical transmission through dual subwavelength metallic gratings.
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DOI：
10.1364/oe.21.013368
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发表时间：
2013-06
期刊：
影响因子：
3.8
通讯作者：
H. Cui;Xuewei Cao;M. Kang;Tengfei Li;Mu Yang;Tianhua Guo;Q. Guo;J. Chen
中科院分区：
文献类型：
--
作者：
H. Cui;Xuewei Cao;M. Kang;Tengfei Li;Mu Yang;Tianhua Guo;Q. Guo;J. Chen
在组成元件中具有多个光学共振的复杂超材料与可以用非厄米哈密顿量描述的开放量子系统具有许多相似之处。通过类比两态开放量子系统，我们证明了在亚波长双金属光栅的透射谱中可以观察到一个典型的例外点的类比。在由横向位移L和入射角φ0所跨越的参数空间中观察到非常光透射的两个分支λ（R）之间的反交叉（交叉）以及相应宽度Γ（R）的交叉（反交叉）。讨论了绕异常点旋转时场型和相位的交换以及场形的变化。这项工作突出了将开放量子系统的概念和应用转移到光学超材料的潜力。
Complex metamaterials with multiple optical resonances in constituent elements possess many similarities with open quantum systems that can be described by non-Hermitian Hamiltonian. By analogy with a two-state open quantum system, we show that a classic analogue of exceptional points can be observed in the transmission spectra of dual subwavelength metallic gratings. Anti-crossing (crossing) between the two branches λ(R) of extraordinary optical transmission, with crossing (anti-crossing) of the corresponding widths Γ(R), is observed in the parameter space spanned by the lateral displacement L and the angle of incidence φ0. Exchanges of field patterns and phases, and the variation of field profile when circling the exceptional point are discussed. This work highlights the potential to transfer the concepts and applications from open quantum systems to optical metamaterials.