Lattice‐Enhanced Fano Resonances from Bound States in the Continuum Metasurfaces,Advanced Optical Materials

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Lattice‐Enhanced Fano Resonances from Bound States in the Continuum Metasurfaces
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-13 , DOI: 10.1002/adom.201901572
Thomas C. W. Tan _{1,

2} , Eric Plum ₃ , Ranjan Singh _{1,

2}

Affiliation

Fano resonances in metamaterials are known for their high quality (Q) factor and high sensitivity to external perturbations, which makes them attractive for sensors, lasers, and nonlinear and slow light devices. However, Fano resonances with higher Q factors obtained through structural optimization of individual resonators are accompanied by lower resonance intensity, thereby limiting the overall figure of merit (FoM) of the resonance. Here, a strategy for simultaneously enhancing the Q factor and FoM of Fano resonances in terahertz metamaterials is reported. Coupling of the Fano resonance, which arises from a symmetry‐protected bound state in continuum, to the first‐order lattice mode of the metamaterial array leads to stronger field confinement and substantial enhancement of both Q factor and FoM. As such enhancement occurs in planar metamaterials independently of the resonator geometry, the proposed approach can be utilized for a wide range of high‐Q and high‐sensitivity terahertz metadevices.

中文翻译：

连续谱超表面中受束缚态的晶格增强的法诺共振

超材料中的Fano共振以其高品质（Q）因子和对外部扰动的高灵敏度而闻名，这使其对于传感器，激光器，非线性和慢光设备具有吸引力。但是，通过单个谐振器的结构优化获得的具有较高Q因子的Fano谐振伴随着较低的谐振强度，从而限制了谐振的总体品质因数（FoM）。这是同时提高Q因子和FoM的策略太赫兹超材料中的Fano共振的报道。Fano共振（由连续体中受对称保护的束缚态引起）与超材料阵列的一阶晶格模式的耦合导致更强的磁场约束以及Q因子和FoM的显着增强。由于这种增强发生在平面超材料中，与谐振器的几何形状无关，因此所提出的方法可用于各种高Q和高灵敏度的太赫兹超颖器件。

更新日期：2020-03-20

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