Fig. 8: Spontaneous emission at exceptional surfaces.
From: Linear response theory of open systems with exceptional points
a A photonic system consisting of a quantum dot embedded in a microring resonator evanescently coupled to a waveguide with an end mirror that induces a unidirectional coupling between these modes. The emission from the quantum dot couples to the CW and CCW modes (a1,2) of the ring and eventually detected by the detectors D1,2. b The ratio ηc of the stored energy in the CCW mode to the stored energy in the CW wave is plotted for the resonant frequency ω = ωo. c The normalized power detected by D1 has a Lorentzian distribution. d The normalized power detected by D2 for Δϕ = 0 (red curve) and Δϕ = π (blue curve) are shown for ∣r∣ = 1. As explained in the text, the detected power spectrum at D2 features an interference between a Lorentzian and a square-Lorentzian terms, with the final outcome strongly depending on the relative position between the mirror and the quantum dot as quantified by the parameter Δϕ.
