70-THz bandwidth from an Au-implanted Ge photoconductive emitter pumped by a mode-locked Er:fibre laser

Abhishek Singh; Alexej Pashkin; Stephan Winnerl; Malte Welsch; Cornelius Beckh; Philipp Sulzer; Alfred Leitenstorfer; Manfred Helm; Harald Schneider

doi:10.1117/12.2568394

20 August 2020 70-THz bandwidth from an Au-implanted Ge photoconductive emitter pumped by a mode-locked Er:fibre laser

Abhishek Singh, Alexej Pashkin, Stephan Winnerl, Malte Welsch, Cornelius Beckh, Philipp Sulzer, Alfred Leitenstorfer, Manfred Helm, Harald Schneider

Author Affiliations +

Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 114990Z (2020) https://doi.org/10.1117/12.2568394
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Germanium is a nonpolar semiconductor with missing Reststrahlen band. In spite of other promising properties including low bandgap and small effective mass, its long, µs-scale recombination time has been prohibitive for applications as photoconductive THz emitters. Using Au-implantated Ge, with recombination times reduced to sub-ns values, we have demonstrated a broadband photoconductive THz emitter compatible with modelocked fibre lasers operating at wavelengths of 1.1 and 1.55 µm and with pulse repetition rates of 78 MHz. Reaching up to 70 THz bandwidth, this approach points towards the possibility of compact, high-bandwidth THz photonic devices compatible with Si CMOS technology.

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Abhishek Singh, Alexej Pashkin, Stephan Winnerl, Malte Welsch, Cornelius Beckh, Philipp Sulzer, Alfred Leitenstorfer, Manfred Helm, and Harald Schneider "70-THz bandwidth from an Au-implanted Ge photoconductive emitter pumped by a mode-locked Er:fibre laser", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 114990Z (20 August 2020); https://doi.org/10.1117/12.2568394

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