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Pulses of femtosecond length from the pump laser (left) generate on-chip electric pulses in the terahertz frequency range. With the right laser, the information is read out again. (Image: Christoph Hohmann / NIM, Holleitner / TUM)

On the road to terahertz electronics

Classical electronics permits frequencies up to around 100 gigahertz. Optoelectronics utilizes electromagnetic phenomena beginning at 10 terahertz. This range in the middle of is...