Highly tunable elastic dielectric metasurface lenses
Highly tunable elastic dielectric metasurface lenses
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DOI：
10.1002/lpor.201600144
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发表时间：
2016-11-01
影响因子：
11
通讯作者：
Faraon, Andrei
中科院分区：
文献类型：
--
作者：
Kamali, Seyedeh Mahsa;Arbabi, Ehsan;Faraon, Andrei
介电超颖表面是由纳米散射体组成的二维结构，其以亚波长空间分辨率操纵光波的相位和偏振，从而实现用于自由空间光学的超薄组件。虽然已经展示了具有各种功能的高性能设备，包括一些使用传统光学设置难以实现的功能，但大多数演示的组件具有固定的参数。在这里，我们展示了高度可调的电介质超颖表面设备的基础上亚波长厚硅纳米柱封装在一个薄的透明弹性聚合物。作为概念的证明，我们展示了超颖表面微透镜工作在915 nm，通过径向应变从600 μ m到1400 μ m（超过952屈光度的光功率变化）的焦距调谐，同时保持衍射限制焦点和50%以上的聚焦效率。所展示的可调超颖表面概念对于开发超薄、多功能和可调光学器件具有高度的通用性，其应用范围从消费电子到医疗设备和光通信。
Dielectric metasurfaces are two-dimensional structures composed of nano-scatterers that manipulate the phase and polarization of optical waves with subwavelength spatial resolution, thus enabling ultra-thin components for free-space optics. While high performance devices with various functionalities, including some that are difficult to achieve using conventional optical setups have been shown, most demonstrated components have fixed parameters. Here, we demonstrate highly tunable dielectric metasurface devices based on subwavelength thick silicon nano-posts encapsulated in a thin transparent elastic polymer. As proof of concept, we demonstrate a metasurface microlens operating at 915 nm, with focal distance tuning from 600 mu m to 1400 mu m (over 952 diopters change in optical power) through radial strain, while maintaining a diffraction limited focus and a focusing efficiency above 50%. The demonstrated tunable metasurface concept is highly versatile for developing ultra-slim, multi-functional and tunable optical devices with widespread applications ranging from consumer electronics to medical devices and optical communications.