Enhanced asymmetric transmission in hyperbolic epsilon-near-zero slabs

Carlo Rizza, Xin Li, Andrea Di Falco, Elia Palange, Andrea Marini, Alessandro Ciattoni

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We investigate the asymmetric transmission for forward and backward propagation of tilted circular polarized optical waves in subwavelength epsilon-near-zero (ENZ) hyperbolic slabs. This chiral-optical effect is solely triggered by anisotropy without resorting to any breaking of reciprocity and chiral symmetries or spatial nonlocal effects. Remarkably, we show that the asymmetric transmission undergoes a dramatic enhancement near the ENZ condition. This happens since, close to the zero-crossing point, the extraordinary waves can accumulate the desired propagation phase even though the slab is ultrathin and, by varying excitation angles and slab thickness, we engineer this phase thus achieving a huge asymmetric transmission. The proposed strategy holds promise for realizing ultra-compact and efficient polarization devices in different frequency range even at very high frequencies (ultraviolet) since the effect is merely due to anisotropy and it is available without resorting to nanofabrication processes.
Original languageEnglish
Article number085001
JournalJournal of Optics
Volume20
Issue number8
Early online date6 Jul 2018
DOIs
Publication statusPublished - Aug 2018

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