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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 17 — Aug. 13, 2012
  • pp: 19006–19015

Single-mode plasmonic waveguiding properties of metal nanowires with dielectric substrates

Yipei Wang, Yaoguang Ma, Xin Guo, and Limin Tong  »View Author Affiliations


Optics Express, Vol. 20, Issue 17, pp. 19006-19015 (2012)
http://dx.doi.org/10.1364/OE.20.019006


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Abstract

Single-mode plasmonic waveguiding properties of metal nanowires with dielectric substrates are investigated using a finite-element method. Au and Ag are selected as plasmonic materials for nanowire waveguides with diameters down to 5-nm-level. Typical dielectric materials with relatively low to high refractive indices, including magnesium fluoride (MgF2), silica (SiO2), indium tin oxide (ITO) and titanium dioxide (TiO2), are used as supporting substrates. Basic waveguiding properties, including propagation constants, power distributions, effective mode areas, propagation distances and losses are obtained at the typical plasmonic resonance wavelength of 660 nm. Compared to that of a freestanding nanowire, the mode area of a substrate-supported nanowire could be much smaller while maintaining an acceptable propagation length. For example, the mode area and propagation length of a 100-nm-diameter Ag nanowire with a MgF2 substrate are about 0.004 μm2 and 3.4 μm, respectively. The dependences of waveguiding properties on geometric and material parameters of the nanowire-substrate system are also provided. Our results may provide valuable references for waveguiding dielectric-supported metal nanowires for practical applications.

© 2012 OSA

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 15, 2012
Revised Manuscript: July 15, 2012
Manuscript Accepted: July 15, 2012
Published: August 2, 2012

Citation
Yipei Wang, Yaoguang Ma, Xin Guo, and Limin Tong, "Single-mode plasmonic waveguiding properties of metal nanowires with dielectric substrates," Opt. Express 20, 19006-19015 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-17-19006


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