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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 4 — Apr. 1, 2008
  • pp: 659–667

Structural asymmetry and induced optical magnetism in plasmonic nanosandwiches

T. Pakizeh, A. Dmitriev, M. S. Abrishamian, N. Granpayeh, and M. Käll  »View Author Affiliations


JOSA B, Vol. 25, Issue 4, pp. 659-667 (2008)
http://dx.doi.org/10.1364/JOSAB.25.000659


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Abstract

A number of recent studies have shown that hybridized antiphase dipolar plasmons, qualitatively similar to magnetic dipole resonances, can be excited in metal–dielectric–metal structures over a wide frequency range. Here, we study how structural asymmetry in plasmonic nanosandwiches, composed of two Au disks separated by a thin SiO 2 layer, affects their near- and far-field optical properties using point-dipole analysis, electrodynamics simulations, and optical spectroscopy. We find that the strength of the antiphase resonant mode can be increased significantly compared to a symmetrical sandwich if the diameters or thicknesses of the nanodisks in the sandwich are made to differ. Such asymmetrical nanosandwiches also exhibit a generally stronger magnetic response, as characterized by the magnetic near-field enhancement in the region between the disks. However, symmetry breaking also leads to pronounced directionality effects in the magnetic near-field, i.e., the enhancement depends on which side of the sandwich that is first illuminated.

© 2008 Optical Society of America

OCIS Codes
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Materials

History
Original Manuscript: September 18, 2007
Revised Manuscript: January 22, 2008
Manuscript Accepted: February 6, 2008
Published: March 31, 2008

Citation
T. Pakizeh, A. Dmitriev, M. S. Abrishamian, N. Granpayeh, and M. Käll, "Structural asymmetry and induced optical magnetism in plasmonic nanosandwiches," J. Opt. Soc. Am. B 25, 659-667 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-4-659

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