
We have observed subpicosecond electrical pulses to propagate on 5-\ensuremath{\mu}m coplanar transmission lines at velocities faster than the phase velocity in the underlying dielectric. This situation produces an electromagnetic shock wave in a manner similar to Cherenkov radiation and electro-optic Cherenkov radiation. Using time-domain spectroscopy we have measured the strong frequency-dependent loss of energy in the propagating electrical pulse due to this radiation.
strong frequency-dependent loss of energy, 5 micron, transmission lines, electro-optic cherenkov radiation, coplanar transmission lines, electromagnetic shock wave, cherenkov radiation, subpicosecond electrical pulses, time-domain spectroscopy
strong frequency-dependent loss of energy, 5 micron, transmission lines, electro-optic cherenkov radiation, coplanar transmission lines, electromagnetic shock wave, cherenkov radiation, subpicosecond electrical pulses, time-domain spectroscopy
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