Raab, J, Lange, C, Boland, JL et al. (9 more authors) (2019) Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers. Optics Express, 27 (3). pp. 2248-2257. ISSN 1094-4087
Abstract
Intersubband (ISB) transitions in semiconductor multi-quantum well (MQW) structures are promising candidates for the development of saturable absorbers at terahertz (THz) frequencies. Here, we exploit amplitude and phase-resolved two-dimensional (2D) THz spectroscopy on the sub-cycle time scale to observe directly the saturation dynamics and coherent control of ISB transitions in a metal-insulator MQW structure. Clear signatures of incoherent pump-probe and coherent four-wave mixing signals are recorded as a function of the peak electric field of the single-cycle THz pulses. All nonlinear signals reach a pronounced maximum for a THz electric field amplitude of 11 kV/cm and decrease for higher fields. We demonstrate that this behavior is a fingerprint of THz-driven carrier-wave Rabi flopping. A numerical solution of the Maxwell-Bloch equations reproduces our experimental findings quantitatively and traces the trajectory of the Bloch vector. This microscopic model allows us to design tailored MQW structures with optimized dynamical properties for saturable absorbers that could be used in future compact semiconductor-based single-cycle THz sources.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/M028143/1 EU - European Union GA 665158 EPSRC EP/P021859/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Jan 2019 11:01 |
Last Modified: | 25 Jun 2023 21:39 |
Status: | Published |
Publisher: | Optical Society of America |
Identification Number: | 10.1364/OE.27.002248 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:140424 |