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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 21, Iss. 12 — Dec. 1, 2004
  • pp: 2442–2446

Geometries and materials for subwavelength surface plasmon modes

Rashid Zia, Mark D. Selker, Peter B. Catrysse, and Mark L. Brongersma  »View Author Affiliations


JOSA A, Vol. 21, Issue 12, pp. 2442-2446 (2004)
http://dx.doi.org/10.1364/JOSAA.21.002442


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Abstract

Plasmonic waveguides can guide light along metal–dielectric interfaces with propagating wave vectors of greater magnitude than are available in free space and hence with propagating wavelengths shorter than those in vacuum. This is a necessary, rather than sufficient, condition for subwavelength confinement of the optical mode. By use of the reflection pole method, the two-dimensional modal solutions for single planar waveguides as well as adjacent waveguide systems are solved. We demonstrate that, to achieve subwavelength pitches, a metal–insulator–metal geometry is required with higher confinement factors and smaller spatial extent than conventional insulator–metal–insulator structures. The resulting trade-off between propagation and confinement for surface plasmons is discussed, and optimization by materials selection is described.

© 2004 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(160.3900) Materials : Metals
(240.0310) Optics at surfaces : Thin films
(240.5420) Optics at surfaces : Polaritons
(240.6680) Optics at surfaces : Surface plasmons
(260.2110) Physical optics : Electromagnetic optics

History
Original Manuscript: May 18, 2004
Revised Manuscript: July 21, 2004
Manuscript Accepted: July 21, 2004
Published: December 1, 2004

Citation
Rashid Zia, Mark D. Selker, Peter B. Catrysse, and Mark L. Brongersma, "Geometries and materials for subwavelength surface plasmon modes," J. Opt. Soc. Am. A 21, 2442-2446 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-12-2442

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