1.National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China
2.Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Author bio:
T Li, Email: taoli@nju.edu.cn, URL: http://dsl.nju.edu.cn/litao/
As one of the recent advances of optics and photonics
plasmonics has enabled unprecedented optical designs. Having a vectorial configuration of surface plasmon field
metallic nanostructures offer efficient solutions in polarization control with a very limited sample thickness. Many compact polarization devices have been realized using such metallic nanostructures. However
in most of these devices
the functions were usually simple and limited to a few polarization states. Here
we demonstrated a plasmonic polarization generator that can reconfigure an input polarization to all types of polarization states simultaneously. The plasmonic polarization generator is based on the interference of the in-plane (longitudinal) field of the surface plasmons that gives rise to versatile near-field polarization states on a metal surface
which have seldom been considered in previous studies. With a well-designed nanohole array
the in-plane field of SPPs with proper polarization states and phases can be selectively scattered out to the desired light beams. A manifestation of eight focusing beams with well-routed polarizations was experimentally demonstrated. Our design offers a new route to achieve the full control of optical polarizations and possibly advance the development in photonic information processing.
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