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Broadband mixing of $${\mathscr{P}}{\mathscr{T}}$$-symmetric and $${\mathscr{P}}{\mathscr{T}}$$-broken phases in photonic heterostructures with a one-dimensional loss/gain bilayer
Combining loss and gain components in one photonic heterostructure opens a new route to efficient manipulation by radiation, transmission, absorption, and scattering of electromagnetic waves. Therefore, loss/gain structures enabling [Formula: see text]-symmetric and [Formula: see text]-broken phases for eigenvalues have extensively been studied in the last decade. In particular, translation …