arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.02667physics.optics
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用于光学频率的独立超颖表面

Freestanding metasurfaces for optical frequencies

M. Prämassing, T. Leuteritz, A. Faßbender, H. J. Schill, S. Irsen, S. Linden

摘要:

我们提出了独立的超颖表面工作在光学频率的总厚度只有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。

英文摘要:

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 transforms a Gaussian input beam into a Laguerre-Gaussian ${LG_{-1,0}}$ mode.

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