Abstract
A hybrid waveguide, which consists of a dielectric wire above a dielectric-metal interface, has been previously proposed to achieve high confinement with low loss. By exciting this geometry with an aperture in the metal that takes advantage of the extraordinary transmission through subwavelength apertures, it is possible to strongly couple to multiple modes. The real part of the fundamental mode is in fact capable of exceeding the index of refraction of all the materials used while maintaining a manageable imaginary part, as a result of appropriate choice of materials for the dielectric wire and the metal. In addition, as the confinement of the second mode is comparable to that of the fundamental mode but has a much longer propagation length, this mode can be utilized in light-guiding applications where enhanced confinement and propagation is desired.
Highlights
Waveguides capable of achieving high confinement with low loss are a key goal in the developing field of plasmonics, with many significant applications on the horizon [1,2,3,4,5,6,7,8,9]
We focus on combining this hybrid waveguide geometry with the configuration of extraordinary transmission through subwavelength dielectric apertures examined previously [19, 20] to form a composite waveguide enabling enhanced confinement and propagation properties
We have examined a novel plasmonic waveguide geometry for use in applications requiring high confinement and low attenuation
Summary
Waveguides capable of achieving high confinement with low loss are a key goal in the developing field of plasmonics, with many significant applications on the horizon [1,2,3,4,5,6,7,8,9]. For cylinder diameters above 120 nm, these modes can be found in two-dimensional (2D) eigenvalue simulations (COMSOL) of the cross section of the horizontal cylinder/dielectric/metal interface, many of the possible 2D modes may have zero/negligible amplitude under the excitation provided by the aperture.
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