Fig. 2: Persistence, stability and interruption of synchronized oscillations.
From: Photonic metamaterial analogue of a continuous time crystal
a–d, Evolution of the spectrum of transmissivity oscillations (SD, spectral density): with time-invariant incident optical power above the threshold of synchronization (a), whereby synchronized oscillation persists indefinitely and the frequency of oscillation does not change; with incident power sinusoidally modulated to a depth of 5% (from the P = 124.3 µW level, at 260 Hz) (b), whereby synchronized oscillation is maintained at a frequency that adiabatically depends on incident power; at a higher level of incident optical power modulation (20%) (c), whereby synchronization is periodically suppressed and recovered, giving rise to transmissivity oscillation bursts, shown in closer detail in d.
