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) Contrast ratio for different orders of resonances. and are the maximum intensities for the light propagating from the right and the left through the PT resonator at FP resonances (n = 0, , , , …).