Liu Jietao, Papakonstantinou Ioannis, Hu Haifeng, Shao Xiaopeng
Opt Lett. 2019 Aug 1;44(15):3829-3832. doi: 10.1364/OL.44.003829.
Plasmon-induced transparency (PIT) in nanostructures has been intensively investigated; however, there are no known metasurface nanostructures that exhibit all optically tunable properties, where the number of transparency windows can be tuned successively and switched to off-state. In this Letter, we theoretically investigate and demonstrate a dynamically tunable, multichannel PIT at optical frequencies. The in-plane destructive interference between bright and dark dipolar resonances in coupled plasmonic nanobar topologies is exploited to produce a tunable PIT with unique characteristics. In particular, we demonstrate a sequential polarization-selective multispectral operation whereby the number of PIT channels can be varied successively from 3 to 0. The results provide a promising route for an active manipulation of PIT and show potential applications for multifunctional dynamic nanophotonics devices.
纳米结构中的表面等离激元诱导透明（PIT）已得到深入研究；然而，目前尚不存在已知的超表面纳米结构能展现出所有光学可调特性，即透明窗口数量可连续调谐并切换至关闭状态。在本信函中，我们从理论上研究并证明了在光频下的动态可调谐多通道PIT。利用耦合等离子体纳米棒拓扑结构中亮暗偶极共振之间的面内相消干涉来产生具有独特特性的可调谐PIT。特别地，我们展示了一种顺序偏振选择性多光谱操作，通过该操作PIT通道数量可从3连续变化至0。这些结果为PIT的主动操控提供了一条有前景的途径，并展示了在多功能动态纳米光子器件中的潜在应用。
