Extreme Huygens' Metasurfaces Based on Quasi-Bound States in the Continuum
Extreme Huygens' Metasurfaces Based on Quasi-Bound States in the Continuum
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DOI：
10.1021/acs.nanolett.8b04774
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发表时间：
2018-12-01
期刊：
影响因子：
10.8
通讯作者：
Choi, Duk-Yong
中科院分区：
文献类型：
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作者：
Liu, Mingkai;Choi, Duk-Yong
通过将惠更斯条件和光界态的概念联系起来，介绍了惠更斯超表面的概念和实现极端惠更斯超表面的一般方法。这种新颖的范例允许创建惠更斯的超表面，其质量因子可以在数量级上进行调整，从而产生极其分散的相位调制。我们通过近红外波长的概念验证实验验证了这一概念，展示了具有不同质量因子的全介电惠更斯超表面。我们的研究指出了在保持惠更斯状态的同时控制辐射衰减率的可行途径，补充了现有惠更斯超表面带宽相对较宽且调谐复杂的问题。这种新特性可以为光学传感、色散工程和脉冲整形、可调谐超表面、高光谱选择性元器件和非线性元光学等各种应用提供新的见解。
We introduce the concept of and a generic approach to realizing extreme Huygens' metasurfaces by bridging the concepts of Huygens' conditions and optical bound states in the continuum. This novel paradigm allows the creation of Huygens' metasurfaces with quality factors that can be tuned over orders of magnitude, generating extremely dispersive phase modulation. We validate this concept with a proof-of-concept experiment at the near-infrared wavelengths, demonstrating all-dielectric Huygens' metasurfaces with different quality factors. Our study points out a practical route for controlling the radiative decay rate while maintaining the Huygens' condition, complementing existing Huygens' metasurfaces whose bandwidths are relatively broad and complicated to tune. This novel feature can provide new insight for various applications, including optical sensing, dispersion engineering and pulse shaping, tunable metasurfaces, metadevices with high spectral selectivity, and nonlinear meta-optics.