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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 23 — Dec. 1, 2011
  • pp: 4713–4715

Long-range surface plasmon polaritons propagating on a dielectric waveguide support

W. Mu and J. B. Ketterson  »View Author Affiliations


Optics Letters, Vol. 36, Issue 23, pp. 4713-4715 (2011)
http://dx.doi.org/10.1364/OL.36.004713


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Abstract

In the traditional long-range surface plasmon geometry, an ultrathin metal film is sandwiched between two layers having identical dielectric constants. Here we demonstrate the long-range surface plasmon polariton (LRSPP) properties for a new structure where a thin layer with a dielectric constant exceeding that of the surroundings is inserted within the sandwich, provided the layer thickness d satisfies the condition k d = m π where k is the component of the guide wavevector perpendicular to the layer and m is an integer. The resulting plasmon modes have smaller losses and nearly the same phase velocity as the original LRSPP. This provides a strategy to support silver films having thicknesses of 10 s of nanometers to create plasmonic devices for sensor applications.

© 2011 Optical Society of America

OCIS Codes
(230.7390) Optical devices : Waveguides, planar
(240.6680) Optics at surfaces : Surface plasmons
(310.4165) Thin films : Multilayer design
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optical Devices

History
Original Manuscript: August 3, 2011
Revised Manuscript: October 4, 2011
Manuscript Accepted: October 18, 2011
Published: December 1, 2011

Citation
W. Mu and J. B. Ketterson, "Long-range surface plasmon polaritons propagating on a dielectric waveguide support," Opt. Lett. 36, 4713-4715 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-23-4713


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References

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  10. Here, we only consider the real part of the left hand side of the equation. For long-range surface plasmon, the wavevector β is a complex number, where the imaginary part is much smaller than the real part; in turn, k2yd2 will also a complex number, with very small imaginary part.
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