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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 29, Iss. 9 — Sep. 1, 2012
  • pp: 2446–2452

Unidirectional radiation of a magnetic dipole coupled to an ultracompact nanoantenna at visible wavelengths

Tavakol Pakizeh  »View Author Affiliations

JOSA B, Vol. 29, Issue 9, pp. 2446-2452 (2012)

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The optical radiation of a magnetic dipole coupled to a plasmonic nanoantenna composed of stacked gold nanodisks is investigated. The nanoantenna is fed by a point magnetic dipole properly situated between two nanodisks. It is found that the magnetic dipole efficiently couples to the antenna due to the excitation of an antiphase localized surface plasmon resonance mode. This leads to a remarkable enhancement of the optical radiation at the resonant wavelength associated with the hybridized mode of the nanoantenna. By introducing a slight structural asymmetry in the nanoantenna, the optical radiation is substantially altered. Interestingly, it is shown that the omnidirectional radiation of the magnetic dipole becomes almost unidirectional, further enhanced, and accessible in three-dimensions by the asymmetric nanoantenna. Based on the classical model, quasistatic theory, and electrodynamics calculations, the electromagnetic interaction of the magnetic dipole and the nanoantennas is studied. A remarkable forward-to-backward directionality is achieved by the proposed nanoantenna at visible wavelengths.

© 2012 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(230.3120) Optical devices : Integrated optics devices
(260.2110) Physical optics : Electromagnetic optics
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: April 9, 2012
Revised Manuscript: June 10, 2012
Manuscript Accepted: July 9, 2012
Published: August 22, 2012

Tavakol Pakizeh, "Unidirectional radiation of a magnetic dipole coupled to an ultracompact nanoantenna at visible wavelengths," J. Opt. Soc. Am. B 29, 2446-2452 (2012)

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