Nong Jinpeng, Feng Fu, Min Changjun, Yuan Xiaocong, Somekh Michael
Opt Lett. 2021 Feb 15;46(4):725-728. doi: 10.1364/OL.416493.
In this Letter, we theoretically propose a coupled borophene plasmonic system, where an anisotropic localized plasmonic (LP) mode and a delocalized guided plasmonic (DGP) mode can be simultaneously excited. This allows us to manipulate the optical response of the strong LP-DGP coupling with exceptional flexibility in the near-infrared region, which is not possible with the conventional metallic plasmonic structures, and overcomes some shortcomings of coupled structures based on the other 2D materials. Specifically, the spatially LP-DGP coupling can arise when the system is driven into the strong coupling regime; this gives rise to a transparency window which can be well described by a coupled oscillation model. The bandwidth of the window is governed by the coupling strength which can be passively adjusted by the spacer thickness, while the center wavelength and the number of windows can be actively modulated by tuning the borophene electron density and the incident angle.
在本信函中，我们从理论上提出了一种耦合硼烯等离子体系统，其中可以同时激发各向异性的局域等离子体（LP）模式和离域导模等离子体（DGP）模式。这使我们能够在近红外区域以极高的灵活性操控强LP-DGP耦合的光学响应，这是传统金属等离子体结构无法实现的，并且克服了基于其他二维材料的耦合结构的一些缺点。具体而言，当系统被驱动到强耦合状态时，会出现空间上的LP-DGP耦合；这会产生一个透明窗口，该窗口可以用耦合振荡模型很好地描述。窗口的带宽由耦合强度决定，耦合强度可以通过间隔层厚度被动调节，而中心波长和窗口数量可以通过调节硼烯电子密度和入射角来主动调制。
