Near-field polarization shaping by a near-resonant plasmonic cross antenna

Paolo Biagioni, Matteo Savoini, Jer-Shing Huang, Lamberto Duò, Marco Finazzi, and Bert Hecht
Phys. Rev. B 80, 153409 – Published 20 October 2009
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Abstract

The optical phase in the feed gap of a plasmonic dipole antenna shows a transition from in-phase to counter-phase response, when its length is varied across the resonance length. We exploit this behavior in an asymmetric cross antenna structure, constituted of two perpendicular dipole antennas with different lengths, sharing the same feed gap, in order to shape the local polarization state. As an application of this concept, we propose a λ/4 nanowaveplate, able to shape and confine linearly polarized propagating waves into circularly polarized fields localized in the feed gap.

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  • Received 31 July 2009

DOI:https://doi.org/10.1103/PhysRevB.80.153409

©2009 American Physical Society

Authors & Affiliations

Paolo Biagioni1,*, Matteo Savoini2, Jer-Shing Huang1, Lamberto Duò2, Marco Finazzi2, and Bert Hecht1,†

  • 1Nano-Optics & Biophotonics Group, Department of Experimental Physics 5, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), Physics Institute, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 2LNESS-Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

  • *Present address: CNISM–Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
  • hecht@physik.uni-wuerzburg.de

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Issue

Vol. 80, Iss. 15 — 15 October 2009

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