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. 2014 Aug 13;4:6046. doi: 10.1038/srep06046

Figure 1. Time-domain waveforms of terahertz radiation emitted from graphene-coated InP under different conditions.

Figure 1

(a), A schematic diagram of the experimental geometry. (b), Time evolution of THz waveforms from graphene-coated InP under continuous excitation by femtosecond near-infrared pulses from a Ti:sapphire laser. The curves are intentionally shifted vertically. (c), THz waveforms from InP (no graphene) under continuous excitation by femtosecond near-infrared pulses from a Ti:sapphire laser. The waveform remains the same even after ten minutes of continuous excitation. (d), THz waveforms from graphene-coated InP in vacuum under continuous excitation by femtosecond near-infrared pulses from a Ti:sapphire laser The waveform remains the same even after ten minutes of continuous excitation. (e), Time evolution of THz waveforms from graphene-coated InP under continuous excitation by femtosecond near-infrared pulses from a Ti:sapphire laser. The vacuum pump is turned on at 10 minutes and the waveform changes drastically.