Fabry–Pérot resonance coupling associated exceptional points in a composite grating structure

Jiang Zhi-Sen^{1, 2}, Hu De-Jiao³, Pang Lin^{1, 2, †}, Gao Fu-Hua^{1, 2}, Wang Ping^{1, 2}

(color online) (a) Forward and (c) backward reflection spectra as a function of wavelength λ and interval G. (b) Forward and (d) backward phase of reflection coefficients.