简易对称三孔缝Babinet超表面中的Fano共振(英文)

桂林电子科技大学广西精密导航与应用技术重点实验室,广西桂林541004

太赫兹器件; Babinet超表面; Fano共振; 可调谐特征; 明模式; 暗模式

Fano resonance in facile symmetric trimeric Babinet metasurface
LI Qi, LIU Fei, XIAO Gongli, ZHANG Fabi, and FU Tao

Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, Guangxi Zhuang Autonomous Region, P.R.China

terahertz device; Babinet metasurfaces; Fano resonance; tunable characteristic; bright mode; dark mode

DOI: 10.3724/SP.J.1249.2019.02157

备注

研究一种结构简单对称三孔缝Babinet超表面在太赫兹频段的Fano共振现象. 发现当沿垂直狭缝方向极化的线极化波垂直入射于超表面时,会引起入射波激发的同相明模式与反相暗模式进行干涉,从而产生Fano共振. 通过调节超表面的结构参数,可以实现同相明模式的单独调谐及反相暗模式的线性变化,也实现了品质因数的调谐,揭示了一种实现Fano共振明暗模式调谐的方法.研究显示,调谐Fano共振的机理在传感器、滤波器、光开关、光电探测器及能量收集器等领域,因其先进的性能而极具应用前景.

A facile symmetric trimeric Babinet metasurface is proposed for producing a Fano resonance in terahertz region. The Fano resonance is excited by an incident wave that interferes with the out-of-phase dark mode when a linearly polarized wave perpendicular to the Babinet slits illuminates the metasurface. By adjusting the structural parameters of the metasurface, the in-phase bright mode can be tuned independently, while the out-of-phase dark mode can be changed linearly, and the quality factor can also be tuned. Overall, a method for tuning the dark and bright modes for Fano resonance is revealed. The tuning mechanism has promise for applications in various fields such as sensors, filters, optical switches, photodetectors, and energy-harvesting devices with advanced performance.

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