Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers.
@article{Raab2019UltrafastTF, title={Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers.}, author={J{\"u}rgen Raab and Christoph Lange and Jessica L. Boland and Ignaz Laepple and Martin Furthmeier and Enrico Dardanis and N. De{\ss}mann and Lianhe Li and Edmund H. Linfield and A. Giles Davies and Miriam Serena Vitiello and Rupert Huber}, journal={Optics express}, year={2019}, volume={27 3}, pages={ 2248-2257 } }
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…
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