High-Efficiency Dielectric Huygens' Surfaces
High-Efficiency Dielectric Huygens' Surfaces
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DOI：
10.1002/adom.201400584
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发表时间：
2015-06-01
影响因子：
9
通讯作者：
Kivshar, Yuri S.
中科院分区：
文献类型：
--
作者：
Decker, Manuel;Staude, Isabelle;Kivshar, Yuri S.
光学超颖表面已经发展成为由亚波长共振纳米结构实现的先进波前工程的突破性概念。然而，反射和/或吸收损耗以及低偏振转换效率对实现实际应用所需的高传输效率构成了根本障碍。在这里，第一次，我们的知识，高效的全介电元表面展示了近红外频率使用硅纳米盘阵列作为元原子。惠更斯源的主要特点，即，光谱重叠交叉的电和磁偶极子共振等强度，以证明惠更斯表面与全传输相位覆盖的360度和近单位传输。实验证实了全相位覆盖与高传输效率相结合。基于这些关键特性，全介质惠更斯超颖表面可以成为平面光学器件的新范例，包括光束转向，光束整形和聚焦，以及全息和色散控制。
Optical metasurfaces have developed as a breakthrough concept for advanced wave-front engineering enabled by subwavelength resonant nanostructures. However, reflection and/or absorption losses as well as low polarization-conversion efficiencies pose a fundamental obstacle for achieving high transmission efficiencies that are required for practical applications. Here, for the first time to our knowledge, highly efficient all-dielectric metasurfaces are demonstrated for NIR frequencies using arrays of silicon nanodisks as metaatoms. The main features of Huygens' sources are employed, namely, spectrally overlapping crossed electric and magnetic dipole resonances of equal strength, to demonstrate Huygens' surfaces with full transmission-phase coverage of 360 degrees and near-unity transmission. Full-phase coverage combined with high efficiency in transmission are experimentally confirmed. Based on these key properties, all-dielectric Huygens' metasurfaces can become a new paradigm for flat optical devices, including beam-steering, beam-shaping, and focusing, as well as holography and dispersion control.