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Updated: Jun 21, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Plasmon dispersion in coaxial waveguides from single-cavity optical transmission measurements
René de Waele1, Stanley P Burgos, Albert Polman
1Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics, 1098 XG Amsterdam, The Netherlands. waele@amolf.nl
Abstract:
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.

