Plasmonic Lens Based on Rectangular Holes
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A compact plasmonic lens is proposed in this paper. This plasmonic lens consists of rectangular holes etched on the silver film and arranged on one straight line and possesses the characteristics of short focus length, ultrathin thickness, and strong focus ability. The theoretical design for the plasmonic lens abides by the constructive interference theorem, and the surface plasmon polaritons excited by the holes with linearly polarized light illumination focuses effectively. The plasmonic lenses with single and double focus spots are provided, and the simulation experiment gives the powerful verification. The distinct structure feature and the excellent focusing characteristic of this plasmonic lens are benefit for its applications in optical integration.
KeywordsSurface plasmon polaritons Plasmonic focusing Nanostructure
The authors acknowledge the support of the National Natural Science Foundation of China under Grant No. 10874105 and Shandong Provincial Natural Science Foundation of China under Grant No. 2015ZRB01864.