Super-Dispersive Off-Axis Meta-Lenses for Compact High Resolution Spectroscopy
Super-Dispersive Off-Axis Meta-Lenses for Compact High Resolution Spectroscopy
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DOI：
10.1021/acs.nanolett.6b01097
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发表时间：
2016-06-01
期刊：
影响因子：
10.8
通讯作者：
Capasso, F.
中科院分区：
文献类型：
--
作者：
Khorasaninejad, M.;Chen, W. T.;Capasso, F.
超颖表面通过允许对波前的特殊控制，开辟了光学技术小型化的新前沿。在这里，我们展示了离轴超透镜，可以以前所未有的光谱分辨率同时聚焦和分散不同波长的光。它们是基于通过旋转硅纳米鳍的几何相位设计的，可以将光聚焦在80度的角度。由于大角度聚焦，这些超透镜具有超色散特性（0.27 nin/mrad），这使得它们能够分辨电信区域中小至200 pm的波长差。此外，通过将多个超透镜拼接在一起，我们可以在更宽的波长范围内保持高光谱分辨率。超透镜在1.1至1.6 μ m波长范围内的测量效率高达90%。这些超透镜的平面和紧凑的配置以及高光谱分辨率对于新兴的便携式/可穿戴光学技术具有显著的潜力。
Metasurfaces have opened a new frontier in the miniaturization of optical technology by allowing exceptional control over the wavefront. Here, we demonstrate off-axis meta-lenses that simultaneously focus and disperse light of different wavelengths with unprecedented spectral resolution. They are designed based on the geometric phase via rotated silicon nanofins and can focus light at angles as large as 80. Due to the large angle focusing, these meta-lenses have superdispersive characteristics (0.27 nin/mrad) that make them capable of resolving wavelength differences as small as 200 pm in the telecom region. In addition; by stitching several meta-lenses together, we maintain a high spectral resolution for a wider wavelength range. The meta-lenses have measured efficiencies as high as 90% in the wavelength range of 1.1 to 1.6 mu m. The planar and compact configuration together with high spectral resolution of these meta-lenses has significant potential for emerging portable/wearable optics technology.