涡旋光束与纳米孔相互作用的远场测量。
Far-field measurements of vortex beams interacting with nanoholes.
作者信息
Zambrana-Puyalto Xavier, Vidal Xavier, Fernandez-Corbaton Ivan, Molina-Terriza Gabriel
机构信息
Department of Physics and Astronomy, Macquarie University, 2109 NSW, Australia.
ARC Centre for Engineered Quantum Systems, Macquarie University, 2109 NSW, Australia.
出版信息
Sci Rep. 2016 Feb 25;6:22185. doi: 10.1038/srep22185.
We measure the far-field intensity of vortex beams going through nanoholes. The process is analyzed in terms of helicity and total angular momentum. It is seen that the total angular momentum is preserved in the process, and helicity is not. We compute the ratio between the two transmitted helicity components, γm,p. We observe that this ratio is highly dependent on the helicity (p) and the angular momentum (m) of the incident vortex beam in consideration. Due to the mirror symmetry of the nanoholes, we are able to relate the transmission properties of vortex beams with a certain helicity and angular momentum, with the ones with opposite helicity and angular momentum. Interestingly, vortex beams enhance the γm,p ratio as compared to those obtained by Gaussian beams.
我们测量了通过纳米孔的涡旋光束的远场强度。从螺旋度和总角动量的角度对该过程进行了分析。可以看出，总角动量在该过程中得以保留，而螺旋度并非如此。我们计算了两个透射螺旋度分量之间的比率γm,p。我们观察到，该比率高度依赖于所考虑的入射涡旋光束的螺旋度（p）和角动量（m）。由于纳米孔的镜面对称性，我们能够将具有特定螺旋度和角动量的涡旋光束的传输特性与具有相反螺旋度和角动量的光束的传输特性联系起来。有趣的是，与高斯光束相比，涡旋光束提高了γm,p比率。
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