Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Rd, Wuhan 430074, China.
Nanoscale. 2018 Nov 7;10(41):19517-19523. doi: 10.1039/c8nr03564d. Epub 2018 Oct 15.
Dynamical manipulation of plasmon-induced transparency (PIT) in metamaterials promises numerous potential applications; however, previously reported approaches require complex metamaterial structures or an external stimulus, and dynamic control is limited to a single PIT transparency window. We propose here a metamaterial with a simple structure to realize a dynamically controllable PIT effect. Simply by changing the polarization direction of incident light, the number of PIT transparency windows can be increased from 1 to 2, accompanied by a tunable amplitude and a switchable resonance-wavelength. Moreover, a coupled three-level plasmonic system is employed to explain the underlying mechanism and near-field coupling between the horizontal and vertical gold bars, and the analytical results show good consistency with the numerical calculations. This work provides a simple approach for designing compact and tunable PIT devices and has potential applications in selective filtering, plasmonic switching and optical sensing.
在超材料中动态控制等离子体诱导透明（PIT）有望实现许多潜在应用；然而，以前报道的方法需要复杂的超材料结构或外部刺激，并且动态控制仅限于单个 PIT 透明窗口。我们在这里提出了一种具有简单结构的超材料来实现动态可控的 PIT 效应。只需改变入射光的偏振方向，就可以将 PIT 透明窗口的数量从 1 增加到 2，同时可调谐幅度和可切换的共振波长。此外，采用耦合的三能级等离子体系统来解释水平和垂直金条之间的潜在机制和近场耦合，并且分析结果与数值计算吻合较好。这项工作为设计紧凑和可调谐的 PIT 器件提供了一种简单的方法，在选择性滤波、等离子体开关和光学传感等方面具有潜在的应用。
