Year: 2019
Type: article
Abstract: Optical systems that respect parity-time ($\mathit{PT}$) 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 $\mathit{PT}$-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.
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2970572808