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Reading the orbital angular momentum of light using plasmonic nanoantennas

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Title: Reading the orbital angular momentum of light using plasmonic nanoantennas
Authors: Kerber, R
Fitzgerald, J
Reiter, D
Oh, S
Hess, O
Item Type: Journal Article
Abstract: Orbital angular momentum of light has recently been recognized as a new degree of freedom to encode information in quantum communication using light pulses. Methods to extract this information include reversing the process by which such twisted light was created in the first place or interference with other beams. Here we propose an alternative new way to directly read out the extra information encoded in twisted light using plasmonic nanoantennas by converting the information about the orbital angular momentum of light into spectral information using bright and dark modes. Exemplarily considering rotation-symmetric nanorod nanoantennas, we show that their scattering cross section is sensitive to the value of the orbital angular momentum combined with the polarization of an incident twisted light beam. Explaining the twist dependence of the excited modes with a new analytical model, our results pave the way to twisted light nanoplasmonics, which is of central importance for future on-chip communication using orbital angular momentum of light.
Issue Date: 2-Mar-2017
Date of Acceptance: 2-Mar-2017
URI: http://hdl.handle.net/10044/1/45415
DOI: https://dx.doi.org/10.1021/acsphotonics.6b00980
ISSN: 2330-4022
Publisher: American Chemical Society
Start Page: 891
End Page: 896
Journal / Book Title: ACS Photonics
Volume: 4
Issue: 4
Copyright Statement: © 2017 American Chemical Society
Sponsor/Funder: The Leverhulme Trust
The Leverhulme Trust
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: F/07 058/BK
German Academic Exchange Service
Publication Status: Published
Appears in Collections:Condensed Matter Theory
Faculty of Natural Sciences