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Spin-polarized unidirectional cylindrical waveguide in bianisotropic media

Karimi, P ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1364/OE.399463
  3. Publisher: OSA - The Optical Society , 2020
  4. Abstract:
  5. In this paper, we analyze a cylindrical waveguide consisting of two layers of bianisotropic material with anti-symmetric magnetoelectric coupling tensors. The analysis is carried out in terms of pseudo-electric and pseudo-magnetic fields which satisfy Maxwells' equations with gyrotropic permittivity and permeability tensors. We show that the rotationally symmetric modes of the waveguide are unidirectional with transverse pseudo-electric and transverse pseudo-magnetic modes propagating in opposite directions. These modes are surface waves whose electromagnetic field is concentrated near the interface between the two anisotropic materials. They follow the contour of the interface even in the case of sharp discontinuities and pass through an obstacle without backscattering if the obstacle does not change the polarization of the wave. Higher-order modes of the waveguide are also investigated. Although these modes are hybrid modes and not, strictly speaking, unidirectional, they practically behave as the rotationally symmetric mode. © 2020 Optical Society of America
  6. Keywords:
  7. Electromagnetic fields ; Surface waves ; Tensors ; Anisotropic material ; Anti-symmetric ; Bianisotropic material ; Bianisotropic media ; Higher-order modes ; Magnetoelectric couplings ; Permeability tensors ; Symmetric mode ; Circular waveguides ; Electromagnetism ; Magnetic field ; Polarization ; Speech
  8. Source: Optics Express ; Volume 28, Issue 16 , 2020 , Pages 24022-24036
  9. URL: https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-16-24022&id=433952