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Polarization conversion in plasmonic nanoantennas for metasurfaces using structural asymmetry and mode hybridization

Polarization conversion in plasmonic nanoantennas for metasurfaces using structural asymmetry and mode hybridization
Polarization conversion in plasmonic nanoantennas for metasurfaces using structural asymmetry and mode hybridization
Polarization control using single plasmonic nanoantennas is of interest for subwavelength optical components in nano-optical circuits and metasurfaces. Here, we investigate the role of two mechanisms for polarization conversion by plasmonic antennas: Structural asymmetry and plasmon hybridization through strong coupling. As a model system we investigate L-shaped antennas consisting of two orthogonal nanorods which lengths and coupling strength can be independently controlled. An analytical model based on field susceptibilities is developed to extract key parameters and to address the influence of antenna morphology and excitation wavelength on polarization conversion efficiency and scattering intensities. Optical spectroscopy experiments performed on individual antennas, further supported by electrodynamical simulations based on the Green Dyadic Method, confirm the trends extracted from the analytical model. Mode hybridization and structural asymmetry allow addressing different input polarizations and wavelengths, providing additional degrees of freedom for agile polarization conversion in nanophotonic devices.
1-11
Wiecha, Peter R.
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Black, Leo-Jay
867ac86c-8bc2-452e-9576-903ca2be6ea2
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
Paillard, Vincent
42984d54-6434-45a6-9b53-41b51bc1f6f6
Girard, Christian
85fb41ad-6753-46a1-b550-b719cf329a52
Muskens, Otto
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Arbouet, Arnaud
3c681c1a-31cf-45dc-9f7f-604b81ebde4e
Wiecha, Peter R.
f297f06e-c298-4f3b-8cb9-98ccd21cd124
Black, Leo-Jay
867ac86c-8bc2-452e-9576-903ca2be6ea2
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
Paillard, Vincent
42984d54-6434-45a6-9b53-41b51bc1f6f6
Girard, Christian
85fb41ad-6753-46a1-b550-b719cf329a52
Muskens, Otto
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Arbouet, Arnaud
3c681c1a-31cf-45dc-9f7f-604b81ebde4e

Wiecha, Peter R., Black, Leo-Jay, Wang, Yudong, Paillard, Vincent, Girard, Christian, Muskens, Otto and Arbouet, Arnaud (2017) Polarization conversion in plasmonic nanoantennas for metasurfaces using structural asymmetry and mode hybridization. Scientific Reports, 7 (40906), 1-11. (doi:10.1038/srep40906).

Record type: Article

Abstract

Polarization control using single plasmonic nanoantennas is of interest for subwavelength optical components in nano-optical circuits and metasurfaces. Here, we investigate the role of two mechanisms for polarization conversion by plasmonic antennas: Structural asymmetry and plasmon hybridization through strong coupling. As a model system we investigate L-shaped antennas consisting of two orthogonal nanorods which lengths and coupling strength can be independently controlled. An analytical model based on field susceptibilities is developed to extract key parameters and to address the influence of antenna morphology and excitation wavelength on polarization conversion efficiency and scattering intensities. Optical spectroscopy experiments performed on individual antennas, further supported by electrodynamical simulations based on the Green Dyadic Method, confirm the trends extracted from the analytical model. Mode hybridization and structural asymmetry allow addressing different input polarizations and wavelengths, providing additional degrees of freedom for agile polarization conversion in nanophotonic devices.

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More information

Accepted/In Press date: 12 December 2016
e-pub ahead of print date: 19 January 2017
Published date: 19 January 2017
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 404963
URI: http://eprints.soton.ac.uk/id/eprint/404963
PURE UUID: 011766a9-375d-4f64-b61e-6a9ab7a5db08
ORCID for Otto Muskens: ORCID iD orcid.org/0000-0003-0693-5504

Catalogue record

Date deposited: 20 Jan 2017 17:12
Last modified: 17 Dec 2019 01:42

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