Abstract
In this paper, we describe waveguide properties of new optical waveguides made of noble metals and filled with glass and air. Such waveguides are coaxial cables and differ from a conventional coaxial in the shape of their central rods. Coaxial waveguide with annular and elliptic central rods are considered. Numerical simulations demonstrate that these waveguides, having nanosize cross-section, support propagation of few comparatively low-loss modes, having phase velocity close to the speed of light and the fields localized in a small area outside a metal. We illustrate excitation of these coaxial modes by dipole-like sources.
Highlights
Miniaturization of optical components is a topical challenge and goes a long way towards nanotechnologies
Coaxial plasmon waveguides are of special interest due to smaller attenuation of the TEM-like mode compared with any mode in the same-size hollow plasmon waveguide [7,8]
We demonstrate that a strong field localization can be achieved in coaxial waveguides with a circular shaped annulus filled with the glass inside
Summary
Miniaturization of optical components is a topical challenge and goes a long way towards nanotechnologies. Reduction of the cross section usually causes an increase of attenuation It was found in [8] that some modes in metal coaxial waveguides exhibit considerably lower losses compared with hollow plasmon waveguides at optical frequencies. It was found that coaxial waveguides made of noble metals support propagation of the azimuthally-symmetric TEM-like plasmonic mode in the optical range [7,8,9]. Coaxial plasmon waveguides are of special interest due to smaller attenuation of the TEM-like mode compared with any mode in the same-size hollow plasmon waveguide [7,8] This mode has a symmetric field distribution and has no cutoff [8] that gives ground to use the term “superenhanced light transmission” [11]. We demonstrate that modes with two orthogonal polarizations can be excited in structures with two crossed elliptic rods
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