Raab, Juergen and Lange, Christoph and Boland, Jessica L. and Laepple, Ignaz and Furthmeier, Martin and Dardanis, Enrico and Dessmann, Nils and Li, Lianhe and Linfield, Edmund H. and Davies, A. Giles and Vitiello, Miriam S. and Huber, Rupert (2019) Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers. OPTICS EXPRESS, 27 (3). pp. 2248-2257. ISSN 1094-4087,
Full text not available from this repository. (Request a copy)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. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM CASCADE LASERS; PULSES; GENERATION; DYNAMICS; RADIATION; EMISSION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Apr 2020 05:56 |
| Last Modified: | 22 Apr 2020 05:56 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27567 |
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