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We demonstrate that a strong asymmetric transmission for forward and backwardpropagation of tilted circular polarized optical waves is supported byultrathin epsilon-near-zero hyperbolic slabs. We find that, remarkably, thiseffect is solely triggered by anisotropy without resorting to any breaking ofreciprocity and chiral symmetries or spatial nonlocal effects. In addition, weshow that the asymmetric transmission undergoes a dramatic enhancement if theslab is hyperbolic in the epsilon-near-zero regime. This happens since, closeto epsilon-near-zero point, the hyperbolic dispersion activates etalonresonances where extraordinary waves accumulate propagation phase even thoughthe slab is ultrathin. The proposed strategy holds promise for realizingultra-compact and efficient polarization devices at different frequency bands.

Diode-like asymmetric transmission in ultrathin hyperbolic epsilon-near-zero slabs: extreme anisotropy mimicking chirality