Enhanced asymmetric transmission in hyperbolic epsilon-near-zero slabs
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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.
Rizza , C , Li , X , Falco , A D , Palange , E , Marini , A & Ciattoni , A 2018 , ' Enhanced asymmetric transmission in hyperbolic epsilon-near-zero slabs ' , Journal of Optics , vol. 20 , no. 8 , 085001 . https://doi.org/10.1088/2040-8986/aacf2f
Journal of Optics
© 2018 IOP Publishing Ltd. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version, this version is also licensed under a Creative Commons CC BY-NC-ND licence. The final published version of this work is available at: https://doi.org/10.1088/2040-8986/aacf2f.
DescriptionCR and AC thank the US Army International Technology Center Atlantic for financial support (Grant No. W911NF-14-1-0315). This work has partially been supported by the CNR-SPIN Seed Project No. B52F17001370005. AM acknowledges support from the 'Rita Levi Montalcini' programme for the recruitment of young researchers. CR and EP acknowledges support from the project NANOPREPAINT—PAR FSC Abruzzo 2007–2013—Linea di Azione I.1.1.a.
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