Tailoring Terahertz Pulses With Moving Fronts: Temporal Stretching And Time-ReversalPaper (OPTO3)
Sat, 14 Nov 2020 12:30am to 12:45am
We demonstrate experimentally a strategy for using relativistic moving dielectric fronts to trigger and affect the generation of coherent terahertz pulses. Akin to DC-to-AC radiation converters, our emission mechanism draws energy from the photoexcitation of built-in static Schottky fields present at metal-semiconductor boundaries in a silicon-filled parallel plate waveguide (PPWG). Fronts tuned to sub-luminal velocity produce terahertz pulses whose electric field temporal profile displays a stretched plateau of quasi-dc character. Super-luminal fronts, on the other hand, provide access to front-induced interactions giving a clear signature of pulse time-reversal.
Authors: Schiff-Kearn, Aidan; Gingras, Lauren; Bernier, Simon; Chamanara, Nima; Agarwal, Kartiek; Ménard, Jean-Michel; Cooke, David
McGill University, University of Ottawa