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太赫兹超材料中的尖锐法诺共振。

Sharp Fano resonances in THz metamaterials.

作者信息

Singh Ranjan, Al-Naib Ibraheem A I, Koch Martin, Zhang Weili

机构信息

School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.

出版信息

Opt Express. 2011 Mar 28;19(7):6312-9. doi: 10.1364/OE.19.006312.

Abstract

We report on the occurrence of sharp Fano resonances in planar terahertz metamaterials by introducing a weak asymmetry in a two gap split ring resonator. As the structural symmetry of the metamaterial is broken a Fano resonance evolves in the low-frequency flank of the symmetric fundamental dipole mode resonance. This Fano resonance can have much higher Q factors than that known from single gap split ring resonators. Supporting simulations indicate a Q factor of 50 for lowest degree of asymmetry. The Q factor decreases exponentially with increasing asymmetry. Hence, minute structural variations allow for a tuning of the Fano resonance. Such sharp resonances could be exploited for biochemical sensing. Besides, the strong current oscillations excited at the Fano resonance frequency could lead to the design of novel terahertz narrow band emitters.

摘要

我们报道了通过在双间隙分裂环谐振器中引入微弱不对称性,在平面太赫兹超材料中出现尖锐的法诺共振。随着超材料结构对称性的破坏,法诺共振在对称基本偶极子模式共振的低频侧翼处演化。这种法诺共振的品质因数可能比单间隙分裂环谐振器已知的品质因数高得多。支持性模拟表明,对于最低程度的不对称性,品质因数为50。品质因数随不对称性增加呈指数下降。因此,微小的结构变化允许对法诺共振进行调谐。这种尖锐的共振可用于生化传感。此外,在法诺共振频率激发的强电流振荡可能导致新型太赫兹窄带发射器的设计。

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