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Soukoulis, Costas M.
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article
Accessible phases via wave impedance engineering with PT -symmetric metamaterials
Abstract
Optical systems that respect parity-time (PT ) symmetry can be realized with proper incorporation of gain/loss materials. However, due to the absence of magnetic response at optical frequencies, the wave impedance is defined entirely by their permittivity and, hence, the PT -symmetric character is controlled solely via their refractive index. Here, we show that the separate tuning of the wave impedance enabled by metamaterials can grant access to wide control of the exceptional points, appearance of mixed phases (coexistence of PT-symmetric and PT-broken phases) and occurrence of phase reentries, not easily realizable with natural materials....