Fig. 1
From: Generalized Fano lineshapes reveal exceptional points in photonic molecules
Modeling of waveguide and near-field resonant transmission in a photonic molecule close to the exceptional point. a Schematics of two coupled-photonic cavities tested by a waveguide, where the e.m. field is propagating from left to right. The waveguide is coupled (red arrows) to the resonator with losses γ1, which is also coupled with coupling strength κ to the upper resonator with losses γ2. b, c Calculated waveguide transmission change due to the presence of the photonic molecule for different values of κ to reproduce both the Autler–Townes splitting (ATS) case, for κ = 1.2κ0, and the electromagnetic-induced transparency (EIT) case, for κ = 0.8κ0, with γ1/γ2 = 10 and γ1/γ2 = 1.1, respectively. The resonant frequencies of the single uncoupled cavities are ω1 = ω2 = ω0. d Schematics of the photonic molecule tested by a near-field probe (blue cone) with incoming and outgoing e.m. waves. e, f Calculated transmission change through the near-field probe for the same cases reported in b and c, respectively. All spectra are calculated by means of the coupled-mode theory (Supplementary Note 4). Horizontal dashed lines represent the zero value of each lineshape
