Wide-angled off-axis achromatic metasurfaces for visible light
Wide-angled off-axis achromatic metasurfaces for visible light
复制标题
用于可见光的广角离轴消色差超表面
DOI：
10.1364/oe.24.023118
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发表时间：
2016-10-03
期刊：
影响因子：
3.8
通讯作者：
Wang, Guo Ping
中科院分区：
文献类型：
--
作者：
Deng, Zi-Lan;Zhang, Shuang;Wang, Guo Ping
我们提出了一种构建多波长消色差超表面的方法，该超表面可以在离轴配置下工作，具有超宽的可见光适用入射角范围。该超表面由多个金属纳米凹槽光栅组合而成，由于不同共振波长下局域间隙等离激元模式的激发，这些光栅在10度至80度的超宽入射角范围内支持横向磁偏振的增强衍射。为了实现消色差衍射，每个基本光栅的谐振波长和周期之间的比率是固定的。这些多个谐振波长的入射光可以有效地衍射到同一方向，并且几乎完全抑制镜面反射。基于类似的方法，我们还设计了一种广角离轴消色差平面透镜，用于将不同波长的光聚焦到同一位置。我们的研究结果提供了另一种简单的方法来设计各种离轴消色差平面光学元件，而无需成像和显示应用的严格角度要求。 (C) 2016年美国光学学会
We present an approach to build multiwavelength achromatic metasurface that can work in off-axis configuration with an ultra-wide applicable incident angle range for visible light. The metasurface is constructed by combining multiple metallic nano-groove gratings, which support enhanced diffractions for transverse magnetic polarization in an ultrawide incident angle range from 10 degrees to 80 degrees due to the excitations of localized gap plasmon modes at different resonance wavelengths. To achieve the achromatic diffraction, the ratio between the resonance wavelength and the period of each elementary grating is fixed. Incident light at those multiple resonance wavelengths can be efficiently diffracted into the same direction with near-complete suppression of the specular reflection. Based on the similar approach, we also design a wide-angled off-axis achromatic flat lens for focusing light of different wavelengths into the same position. Our findings provide an alternative simple way to design various off-axis achromatic flat optical elements without stringent angle requirement for imaging and display applications. (C) 2016 Optical Society of America