Fig. 4
Ultrafast quasi-BIC switching. a, b Maps of the simulated ΔT/T without (a) and with (b) the additional losses Δεadd = i0.01. The temporal and spectral resolution of the simulations are 25 fs and 0.01 nm, respectively. c, d Transmission spectra at selected time delays, obtained from the same simulations as the respective panels above. The inset in (c) shows the Ez electric field at λprobe = 765.58 nm and t = 175 fs, corresponding to the minimum of the blue curve
