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Plasmon Dispersion in Coaxial Waveguides from Single-Cavity Optical Transmission Measurements

de Waele, Rene and Burgos, Stanley P. and Polman, Albert and Atwater, Harry A. (2009) Plasmon Dispersion in Coaxial Waveguides from Single-Cavity Optical Transmission Measurements. Nano Letters, 9 (8). pp. 2832-2837. ISSN 1530-6984. doi:10.1021/nl900597z.

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We determine the plasmon dispersion relation in coaxial waveguides composed of a circular channel separating a metallic core and cladding. Optical transmission measurements are performed on isolated coaxial nanoapertures fabricated on a Ag film using focused ion-beam lithography. The dispersion depends strongly on the dielectric material and layer thickness. Our experimental results agree well with an analytical model for plasmon dispersion in coaxial waveguides. We observe large phase shifts at reflection from the end facets of the coaxial cavity, which strongly affect the waveguide resonances and can be tuned by changing the coax geometry, composition, and surrounding dielectric index, enabling coaxial cavities with ultrasmall mode volumes.

Item Type:Article
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URLURL TypeDescription
Polman, Albert0000-0002-0685-3886
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2009 American Chemical Society. Received February 24, 2009; Revised Manuscript Received July 8, 2009. Publication Date (Web): July 15, 2009. The authors gratefully acknowledge helpful discussions with J. A. Dionne, A. F. Koenderink, H. J. Lezec, and E. Verhagen. We acknowledge financial support from the National Science Foundation, under Grant DMR 0606472; portions of this work were performed in facilities sponsored by the Center for Science and Engineering of Materials, an NSF MRSEC. This work is also part of the research program of the “Stichting voor Fundamenteel Onderzoek der Materie (FOM)”, which is financially supported by the “Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)”. It was also supported by “NanoNed”, a nanotechnology program funded by the Dutch Ministry of Economic Affairs.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20090826-112851483
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15323
Deposited By: George Porter
Deposited On:11 Sep 2009 16:18
Last Modified:08 Nov 2021 23:18

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