Liu Mingkai, Choi Duk-Yong
College of Information Science and Technology , Jinan University , Guangzhou , Guangdong 510632 , China.
Nano Lett. 2018 Dec 12;18(12):8062-8069. doi: 10.1021/acs.nanolett.8b04774. Epub 2018 Dec 3.
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.
我们通过弥合惠更斯条件和连续统中的光学束缚态的概念，引入了实现极端惠更斯超表面的概念和通用方法。这种新颖的范式允许创建品质因数可在多个数量级上调节的惠更斯超表面，从而产生极色散的相位调制。我们在近红外波长下通过概念验证实验验证了这一概念，展示了具有不同品质因数的全介质惠更斯超表面。我们的研究指出了一条在保持惠更斯条件的同时控制辐射衰减率的实用途径，补充了现有的带宽相对较宽且难以调节的惠更斯超表面。这一新颖特性可为各种应用提供新的见解，包括光学传感、色散工程和脉冲整形、可调谐超表面、具有高光谱选择性的超器件以及非线性超光学。
