Extended Data Fig. 3: NOTE transients sampled on Au(111).
From: All-optical subcycle microscopy on atomic length scales
Electro-optically detected scattered THz transients measured at the first three harmonics of the tip-tapping frequency (A = 1 nm). In each panel, the red curve shows the case of an approached tip, where tunnelling currents can flow (\(\langle \,{J}_{{\rm{lw}}}\,\rangle =-300\,{\rm{pA}}\), on average about 140 rectified electrons per pulse, Δν = −4.8 Hz, \({\hat{E}}_{{\rm{light}}}=1.3\) kV cm−1). The blue curve shows the case where the tip is retracted away from the tunnelling barrier.
