Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers
| Autor: | A. Giles Davies, Christoph Lange, Jürgen Raab, Rupert Huber, Edmund H. Linfield, Lianhe Li, Martin Furthmeier, Miriam S. Vitiello, Enrico Dardanis, Ignaz Laepple, Jessica L. Boland, Nils Dessmann |
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| Rok vydání: | 2019 |
| Předmět: |
Terahertz radiation
FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences 010309 optics Electric field 0103 physical sciences Saturation (magnetic) Physics business.industry ddc:530 530 Physik 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Nonlinear system Semiconductor Amplitude Coherent control Optoelectronics 0210 nano-technology business Ultrashort pulse Optics (physics.optics) Physics - Optics |
| Zdroj: | Boland, J L & et al 2019, ' Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers ', Optics Express . https://doi.org/10.1364/oe.27.002248 Optics Express Optics express 27 (2019): 2248–2257. doi:10.1364/OE.27.002248 info:cnr-pdr/source/autori:Raab J.; Lange C.; Boland J.L.; Laepple I.; Furthmeier M.; Dardanis E.; Dessmann N.; Li L.; Linfield E.H.; Giles Davies A.; Vitiello M.S.; Huber R./titolo:Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers/doi:10.1364%2FOE.27.002248/rivista:Optics express/anno:2019/pagina_da:2248/pagina_a:2257/intervallo_pagine:2248–2257/volume:27 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.27.002248 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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