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) Magnetic field distribution of aperture mode at λ = 900 nm. (b) Magnetic field distribution of the gap mode at λ = 1100 nm and G = 570 nm. (c) Forward reflection spectra of the composite structure as a function of interval G and wavelength λ. The white dashed line represents aperture mode and the white solid line represents gap mode. The red arrow points to the zero reflection point.