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Plasmonics

, Volume 13, Issue 6, pp 2151–2160 | Cite as

Simulation and Analytical Study of Optical Complex Field in Nano-corral Slits Plasmonic Lens

  • Priyanshu Jain
  • Sandeep Gupta
  • Tanmoy Maiti
Article
  • 110 Downloads

Abstract

Although spiral plasmonic lens has been proposed as circular polarization analyzer, there is no such plasmonic nanostructure available for linear polarization. In the current work, we have designed nano-corral slits (NCS) plasmonic lens, which focuses the x- and y-polarized light into spatially distinguished plasmonic fields. We have calculated analytically and numerically the electric field intensity and phase of the emission from nano-corral slits plasmonic lens with different pitch lengths under various polarizations of the illumination. It has been shown that one can control the wave front of the output beam of these plasmonic lenses by manipulating the illumination of both circular and linear polarization. Our theoretical study in correlation with FDTD simulation has shown that NCS plasmonic lens with pitch length equal to λspp produces scalar vortex beam having optical complex fields with helical wave front and optical singularity at the center under circular polarization of light. When NCS lens (pitch = λspp) is illuminated with linearly polarized light, it exhibits binary distribution of phase with same electric field intensity around the center. However, with pitch length of 0.5λspp, NCS shows linear dichroism under linearly polarized illumination unlike spiral plasmonic lens (SPL) eliminating the use of circularly polarized light. Optical complex fields produced by these NCS plasmonic lenses may find applications for faster quantum computing, data storage, and telecommunications.

Keywords

Plasmonic Lens Nano-corral slits Optical complex field Nanophotonics 

Notes

Funding Information

The authors received financial assistance from the Indian Space Research Organisation (ISRO) under Grant STC- MET-2015099.

Supplementary material

11468_2018_732_MOESM1_ESM.docx (2 mb)
ESM 1 (DOCX 2087 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Plasmonics and Perovskites Laboratory, Department of Materials Science and EngineeringIndian Institute of Technology KanpurKanpurIndia

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