16 September 2016 Magnetically controllable circulator based on photonic crystal unidirectional waveguide consisting of metamaterials
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Abstract
Unidirectional edge modes are achieved in gyromagnetic photonic crystals. The physical reason is attributed to magnetic resonance and broken time-reversal symmetry under external magnetic fields. These edge modes propagate only along a single direction, while the backward modes are completely suppressed. The unidirectional transmittance is nearly 100% and hardly affected by perfect electric conductor (PEC) defect. However, a PEC defect has sensitive influence on both the phase delay and pattern distribution of unidirectional edge modes. These properties hold promise in designing various unidirectional devices. Here we design a three port circulator with high transmission contrast and magnetic controllability simultaneously.
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Wenyao Liang, Wenyao Liang, } "Magnetically controllable circulator based on photonic crystal unidirectional waveguide consisting of metamaterials", Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99182H (16 September 2016); doi: 10.1117/12.2236158; https://doi.org/10.1117/12.2236158
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