Freestanding metasurfaces for optical frequencies.
Freestanding metasurfaces for optical frequencies.
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DOI：
10.1364/ol.44.002105
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发表时间：
2019-02
期刊：
影响因子：
3.6
通讯作者：
M. Prämassing;T. Leuteritz;H. Schill;A. Faßbender;Stephan Irsen;Stefan Linden
中科院分区：
文献类型：
--
作者：
M. Prämassing;T. Leuteritz;H. Schill;A. Faßbender;Stephan Irsen;Stefan Linden
我们提出了独立的超颖表面在光频率下工作，总厚度只有40 nm。通过聚焦离子束铣削碳膜中的纳米空隙，然后热蒸发金和等离子体灰化碳膜来制造超颖表面。作为第一个例子，我们展示了一个超表面透镜的基础上共振的V形纳米空隙的焦距为1毫米。第二个例子是一个超表面相板组成的适当取向的矩形纳米空隙，将高斯输入光束转换成拉盖尔-高斯LG-1，0模式。
We present freestanding metasurfaces operating at optical frequencies with a total thickness of only 40 nm. The metasurfaces are fabricated by focused ion beam milling of nanovoids in a carbon film followed by thermal evaporation of gold and plasma ashing of the carbon film. As a first example, we demonstrate a metasurface lens based on resonant V-shaped nanovoids with a focal length of 1 mm. The second example is a metasurface phase plate consisting of appropriately oriented rectangular nanovoids that transform a Gaussian input beam into a Laguerre-Gaussian LG-1,0 mode.