Fig. 2: Device characterization.
From: Controlling single rare earth ion emission in an electro-optical nanocavity
a Reflection spectrum of the resonator. A Lorentzian fit (orange curve) yields Q = 1.58 × 105. b Resonance frequency shift under different applied voltage. The reflection spectrum of each voltage is offset for clarity. A tuning rate of 1.6 pm/V is extracted. c Time-domain fluorescence measurement of Er ions in the waveguide (orange) and cavity (blue) and exponential fitting. Enhancement of emission rate is shown by the shortened lifetime (T1) inside the cavity. The inset shows an energy level diagram of Er ions. We pump (green) on the Y1 −Z1 transition centering around 1532 nm and collect the resonant fluorescence (purple).
