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Optimal polarization conversion in coupled dimer plasmonic nanoantennas for metasurfaces

Optimal polarization conversion in coupled dimer plasmonic nanoantennas for metasurfaces
Optimal polarization conversion in coupled dimer plasmonic nanoantennas for metasurfaces
We demonstrate that polarization conversion in coupled dimer antennas, used in phase discontinuity metasurfaces, can be tuned by careful design. By controlling the gap width, a strong variation of the coupling strength and polarization conversion is found between capacitively and conductively coupled antennas. A theoretical two-oscillator model is proposed, which shows a universal scaling of the degree of polarization conversion with the energy splitting of the symmetric and antisymmetric modes supported by the antennas. Using single antenna spectroscopy, we find good agreement for the scaling of mode splitting and polarization conversion with gap width over the range from capacitive to conductive coupling. Next to linear polarization conversion, we demonstrate single-antenna linear to circular polarization conversion. Our results provide strategies for phase-discontinuity metasurfaces and ultracompact polarization optics.
plasmonic nanoantennas, polarization conversion, phase discontinuity, metamaterials, metasurfaces, green's dyadic method
1936-0851
6390-6399
Black, Leo-Jay
867ac86c-8bc2-452e-9576-903ca2be6ea2
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Arbouet, Arnaud
3c681c1a-31cf-45dc-9f7f-604b81ebde4e
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Black, Leo-Jay
867ac86c-8bc2-452e-9576-903ca2be6ea2
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Arbouet, Arnaud
3c681c1a-31cf-45dc-9f7f-604b81ebde4e
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9

Black, Leo-Jay, Wang, Yudong, de Groot, C.H., Arbouet, Arnaud and Muskens, Otto L. (2014) Optimal polarization conversion in coupled dimer plasmonic nanoantennas for metasurfaces. ACS Nano, 8 (6), 6390-6399. (doi:10.1021/nn501889s).

Record type: Article

Abstract

We demonstrate that polarization conversion in coupled dimer antennas, used in phase discontinuity metasurfaces, can be tuned by careful design. By controlling the gap width, a strong variation of the coupling strength and polarization conversion is found between capacitively and conductively coupled antennas. A theoretical two-oscillator model is proposed, which shows a universal scaling of the degree of polarization conversion with the energy splitting of the symmetric and antisymmetric modes supported by the antennas. Using single antenna spectroscopy, we find good agreement for the scaling of mode splitting and polarization conversion with gap width over the range from capacitive to conductive coupling. Next to linear polarization conversion, we demonstrate single-antenna linear to circular polarization conversion. Our results provide strategies for phase-discontinuity metasurfaces and ultracompact polarization optics.

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BlackACSNano_140325.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 7 May 2014
e-pub ahead of print date: 7 May 2014
Keywords: plasmonic nanoantennas, polarization conversion, phase discontinuity, metamaterials, metasurfaces, green's dyadic method
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 366970
URI: http://eprints.soton.ac.uk/id/eprint/366970
ISSN: 1936-0851
PURE UUID: 4e59bf92-cf11-425a-a606-5046a138a376
ORCID for C.H. de Groot: ORCID iD orcid.org/0000-0002-3850-7101
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504

Catalogue record

Date deposited: 21 Jul 2014 10:09
Last modified: 03 Dec 2019 01:52

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