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Self-complementary metasurfaces have gained significant attention due totheir unique frequency-independent transmission and reflection properties andthe possibility of the polarization transformation of plane waves. In thispaper, we focus on the near-field spectrum to investigate both theoreticallyand experimentally the properties of surface waves supported by anisotropicself-complementary metasurfaces. We show that as a consequence of theelectromagnetic Babinet's duality, such structure is hyperbolic for anyfrequency. We reveal the polarization degree of freedom inherent to plane wavesby demonstrating the broadband TE-TM polarization degeneracy of the surfacewaves along two principal directions. We demonstrate the possibility ofswitching the canalization direction of 90 degrees by a very small frequencyshift paving a way to the extreme tunability and surface wave routing. Theresults obtained open a plethora of opportunities for practical applications,including flat polarization devices, optical data processing systems andantennas.

Surface waves on self-complementary metasurfaces: intrinsic hyperbolicity, dual-directional canalization and TE-TM polarization degeneracy