Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Ultra-fast phenomena
HL 26.1: Talk
Wednesday, March 14, 2018, 09:30–09:45, EW 202
Towards femtosecond on-chip electronics based on plasmonic hot electron nano-emitters — Christoph Karnetzky1,2, Philipp Zimmermann1,2, Noelia Fernandez1,3, •Christopher Trummer1,2, Carolina Duque-Sierra1,2, Martin Wörle4, Reinhard Kienberger4, and Alexander W. Holleitner1,2 — 1Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany — 2Nanosystems Initiative Munich (NIM), Schellingstr. 4, 80799 Munich, Germany — 3Max Planck Institut für Quantenoptik, Hans Kopfermann Str. 1, 85748 Garching, Germany — 4Physik-Department E11, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
To combine the advantages of ultrafast nano-optics with an on-chip communication scheme, optical signals with a frequency of several hundreds of THz need to be down-converted to coherent electronic signals of GHz or less.Here, we demonstrate that 14 fs optical pulses in the near-infrared can drive electronic on-chip circuits with a bandwidth up to 10 THz. The electronic pulses propagate in macroscopic striplines on a millimeter scale. We exploit femtosecond photoswitches based on tunneling barriers in nanoscale metal junctions to drive the pulses. The non-linear ultrafast response is based on a combination of plasmonically enhanced, multi-photon absorption and quantum tunneling, and gives rise to a field emission of ballistic electrons propagating across the nanoscale junctions. Our results pave way towards femtosecond electronics integrated in wafer-scale quantum circuits.