Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators

Jordan A. Hachtel; Sang-Yeon Cho; Roderick B. Davidson II; Matthew A. Feldman; Matthew F. Chisholm; Richard F. Haglund; Juan Carlos Idrobo; Sokrates T. Pantelides; Benjamin J. Lawrie

doi:10.1038/s41377-019-0136-z

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Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators

Articles

- Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators
- Light: Science & Applications Vol. 8, Issue 2, Pages: 288-296(2019)
- Affiliations：
  
  1.Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
  2.Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM, 88003, USA
  3.Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, 37235, USA
  4.Quantum Information Science Group, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
  5.Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
  6.Department of Electrical Engineering and Computer Science, Vanderbilt University Nashville, Nashville, TN, 37235, USA
  7.Present address: Chemistry Division, U.S. Naval Research Laboratory, Washington, D.C. 20375, USA.
- Author bio：
  
  Jordan A. Hachtel (hachtelja@ornl.gov)
  Sang-Yeon Cho (sangycho@nmsu.edu)
- Funds：
- DOI：10.1038/s41377-019-0136-z
  CLC：
- Published：2019，
  
  Published Online：20 March 2019，
  
  Received：05 December 2018，
  
  Revised：02 February 2019，
  
  Accepted：06 February 2019
- Accepted：
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Hachtel, J. A. et al. Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators. Light: Science & Applications, 8, 288-296 (2019).
DOI：

Hachtel, J. A. et al. Spatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators. Light: Science & Applications, 8, 288-296 (2019). DOI： 10.1038/s41377-019-0136-z.

摘要

Abstract

Understanding the near-field electromagnetic interactions that produce optical orbital angular momentum (OAM) is crucial for integrating twisted light into nanotechnology. Here

we examine the cathodoluminescence (CL) of plasmonic vortices carrying OAM generated in spiral nanostructures. The nanospiral geometry defines a photonic local density of states that is sampled by the electron probe in a scanning transmission electron microscope (STEM)

thus accessing the optical response of the plasmonic vortex with high spatial and spectral resolution. We map the full spectral dispersion of the plasmonic vortex in spiral structures designed to yield increasing topological charge. Additionally

we fabricate nested nanospirals and demonstrate that OAM from one nanospiral can be coupled to the nested nanospiral

resulting in enhanced luminescence in concentric spirals of like handedness with respect to concentric spirals of opposite handedness. The results illustrate the potential for generating and coupling plasmonic vortices in chiral nanostructures for sensitive detection and manipulation of optical OAM.

关键词

Keywords

references

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