Gong Sen, Bi Chunyang, Wang Lan, Zeng Hongxin, Lan Feng, Yang Ziqiang, Zhang Yaxin
Opt Express. 2022 Nov 7;30(23):41264-41270. doi: 10.1364/OE.472959.
In this paper, we propose a dynamic transmission structure based on the coupling reconfiguration of spoof surface plasmon polaritons (SSPPs) in a 2D coplanar grating. By embedding a VO film into the signal line, the dynamic transmission is realized by reconfiguring the coupling of terahertz waves from quasi-TEM waves to SSPPs. The analysis shows that the transmission can be modulated in almost the entire band of the SSPPs, which further benefits a promising group delay due to the weak dispersion characteristic in the frequency region much lower than the cut-off frequency of SSPPs. In addition, for the dynamic modulation caused by the coupling reconfiguration, only rather a small area of VO film is needed to break the robustness of the 2D coplanar grating. Therefore, the coupling reconfiguration mechanism proposed in this paper facilitates the realization of an easily on-chip integrated dynamic SSPPs transmission structure with ultra-large bandwidth, and low group delay time difference. Accordingly, the presented mechanism will play a positive role in promoting the development of terahertz dynamic devices.
在本文中，我们提出了一种基于二维共面光栅中欺骗表面等离激元（SSPPs）耦合重构的动态传输结构。通过将氧化钒（VO）薄膜嵌入信号线中，通过将太赫兹波从准横电磁波（quasi-TEM waves）耦合重构为SSPPs来实现动态传输。分析表明，传输可以在SSPPs的几乎整个频段内进行调制，由于在远低于SSPPs截止频率的频率区域具有较弱的色散特性，这进一步有利于实现有前景的群延迟。此外，对于由耦合重构引起的动态调制，只需要相当小面积的VO薄膜就能打破二维共面光栅的稳健性。因此，本文提出的耦合重构机制有助于实现一种易于片上集成的、具有超大带宽和低群延迟时间差的动态SSPPs传输结构。相应地，所提出的机制将对促进太赫兹动态器件的发展起到积极作用。
