Guiding waves along an infinitesimal line between impedance surfaces

Abstract

We present a new electromagnetic mode that forms at the interface between two planar surfaces laid side by side in free space, effectively guiding energy along an infinitesimal, one-dimensional line. It is shown that this mode occurs when the boundaries have complementary surface impedances, and it is possible to control the mode confinement by altering their values correspondingly. The mode exhibits singular field enhancement, broad bandwidth, direction-dependent polarization, and robustness to certain defects. As a proof-of-concept, experimental results in the microwave regime are provided using patterned conducting sheets. Our proposed effective-medium-based approach is general, however, thus allowing for potential implementation up to optical frequencies. Our system is promising for applications including integrated photonics, sensing, switching, chiral quantum coupling, and reconfigurable waveguides.

arXiv comment10 pages, 5 figures

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• Indifferent electromagnetic modes: bound states and topology
• Surface-Wave Propagation on Non-Hermitian Metasurfaces with Extreme Anisotropy
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• Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides
• Unidirectional plasmonic edge modes on general two-dimensional materials
• Excitation of Surface Waves with On-Demand Polarization at Self-Complementary Metasurface
• Quasi-Babinet principle in dielectric resonators and Mie voids
• Spectral-domain method of moments for the modal analysis of line waveguides
• Electromagnetic Scattering Resonances of Quasi-1D Nanoribbons
• Zero index electromagnetic materials
• Complementary metasurfaces for guiding electromagnetic waves