Isotropic Backward Waves Supported by a Spiral Array Metasurface.

Ben TremainIan R HooperJ Roy SamblesAlastair P Hibbins

Published in: Scientific reports (2018)

A planar metallic metasurface formed of spiral elements is shown to support an isotropic backward wave over a narrow band of microwave frequencies. The magnetic field of this left-handed mode is mapped experimentally using a near-field scanning technique, allowing the anti-parallel group and phase velocities to be directly visualised. The corresponding dispersion relation and isofrequency contours are obtained through Fourier transformation of the field images.

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