Fig. 3

Finite-difference time-domain calculations of near-field resonant scattering in proximity to the exceptional point. a The near-field spectrum obtained by employing dipole light sources embedded in the slab, thus resembling the photoluminescence experiment, results in a Lorentzian line. b Schematic of the photonic molecule: five central air pores (red circles) are reduced to tailor the coupling. The sketch shows a resonant-scattering simulation where a polarized plane wave is impinging on the slab from the bottom. The plane wave is characterized by the blue and red wavefronts, the wavevector k and the electric field polarized along the x-direction. A, B, C, D, and E indicate the positions where the spectra reported in c–g are evaluated. c–g Near-field spectra of the RS transmission evaluated by employing the layout reported in b. The spectrum in c is a standard Fano profile. d–g Spectra exhibiting generalized Fano profiles with 0, 1, 2, 3 crossings with the zero-value baseline, respectively