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Efficient transmissive pure-phase resonances are highly desirable for opticalmodulation and wavefront engineering. Here, we propose a novel principle torealize a pure-phase resonance in an extremely broad transmission band, asopposed to previous approaches restricted to operating in reflection mode orover a narrow spectral band. We show that a glide-symmetric bilayer metasurfacemathematically mimicking a two-dimensional Dirac semimetal inducesunidirectional guided-mode excitation and perfect leakage-radiation blazing atthe transmission channel. These effects create a peculiar resonant-scatteringconfiguration, similar to the classical reflective Gires-Tournois etalon, butin transmission, providing full 2pi phase modulation with constanttransmittance near 100%. Most importantly, this effect persists over anextremely wide band, associated with topological effects. Hence, our proposedapproach produces a spectrally and parametrically robust pure-phase resonanceeffect in transmission, which is highly beneficial for practical applications.

Dirac Bilayer Metasurfaces as an Inverse Gires-Tournois Etalon