Fig. 5

Near-field measurements in both the frequency and time domains. a Normalized photoemission (PE) intensity curves against the wavelength in the frequency domain. b Normalized PE intensity curves against the time delay in the time domain obtained by time-resolved photoemission electron microscopy (PEEM) measurements. c Calculated time-resolved PE signals with the best fitted dephasing time. The nanoblock size is fixed as 115 nm and the period is tuned from 400 to 600 nm