All-dielectric coaxial waveguide with annular sections
AssigneeMassachusetts Institute of Technology
InventorsJohn D. Joannopoulos, Yoel Fink, Mihai Ibanescu, Edwin Thomas
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Abstract
An all-dielectric coaxial waveguide comprising a dielectric core region; an annulus of dielectric material, surrounding the core region, in which electromagnetic radiation is confined; and an outer region of cylindrically coaxial dielectric shells of alternating indices of refraction surrounding the annulus. The core region and the outer region have an average index of refraction which is higher than the index of refraction of the annulus.
Claims12
An all-dielectric coaxial waveguide comprising:
- a dielectric core region;
- an annulus of dielectric material, surrounding said core region, in which electromagnetic radiation is confined;
- and
- an outer region of cylindrically coaxial dielectric shells of alternating indices of refraction surrounding said annulus, wherein
- said core region and said outer region have an average index of refraction which is higher than the index of refraction of said annulus.
An all-dielectric coaxial waveguide which exhibits omnidirectional reflection, comprising:
- a dielectric core region;
- an annulus of dielectric material in which electromagnetic radiation in confined;
- and
- an outer region of cylindrically coaxial dielectric shells of alternating indices of refraction surrounding said annulus, wherein
- said refractive indices, the number of shells, and thickness of said outer region result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of said electromagnetic radiation.
Dependencies are inferred from the claim text.