Fig. 1
From: Experimental band structure spectroscopy along a synthetic dimension
Dynamically modulated ring cavity and its band structure in the synthetic frequency dimension. a A sinusoidal signal VM modulates the index of a part of the ring (left) at the mode spacing ΩR, creating coupling J between the different frequency modes (right). EOM electro-optic phase modulator. b Band structure of the nearest-neighbor coupled 1D tight-binding model, εk = 2J cos kΩ. c Theoretical time-resolved steady-state response of the ring (Eq. 16) for a cavity loss rate 2γ = J/5. The time t plays the role of the Bloch quasimomentum k
