Extended Data Fig. 4: HHG signal from graphene, reference signal from the SiO2 substrate and filter function of the 2.1-THz bandpass.
From: Extremely efficient terahertz high-harmonic generation in graphene by hot Dirac fermions
The red curve shows the as-measured HHG spectrum of the graphene sample. The black curve shows the reference spectrum taken from the bare SiO2 substrate. The measured transmission function of the 2.1-THz bandpass filter is also shown (grey line).
