Bifurcated overtones of one-way localized Fabry–Pérot resonances in parity-time symmetric optical lattices

Gaafer Fatma Nafaa¹, Shen Yaxi¹, Peng Yugui¹, Wu Aimin^{2, †}, Zhang Peng^{3, ‡}, Zhu Xuefeng^{1, 2, 4, §}

(color online) Scattering properties of the PT resonator. (a) Calculations of T, , and . (b) Spectral positions of Fabry–Pérot resonances (marked by the numbers in panel (a)]. At the resonances (n = 0, , , , ), the PT resonator is bidirectionally transparent.