Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers.

  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},
  volume={27 3},
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… 
5 Citations

Figures from this paper

Ultrafast terahertz saturable absorbers using tailored intersubband polaritons
Semiconductor heterostructures have enabled a great variety of applications ranging from GHz electronics to photonic quantum devices. While nonlinearities play a central role for cutting-edge
Two-dimensional spectroscopy on a THz quantum cascade structure
Abstract Understanding and controlling the nonlinear optical properties and coherent quantum evolution of complex multilevel systems out of equilibrium is essential for the new semiconductor device
Chip‐Scale Terahertz Frequency Combs through Integrated Intersubband Polariton Bleaching
Quantum cascade lasers (QCLs) represent a fascinating accomplishment of quantum engineering and enable the direct generation of terahertz (THz) frequency radiation from an electrically biased
Nonlinear intensity dependence of terahertz edge photocurrents in graphene
S. Candussio, L. E. Golub, S. Bernreuter, T. Jötten, T. Rockinger, K. Watanabe, T. Taniguchi, J. Eroms, D. Weiss, and S.D. Ganichev Terahertz Center, University of Regensburg, 93040 Regensburg,
Origin of Terahertz Soft-Mode Nonlinearities in Ferroelectric Perovskites
Terahertz spectroscopy reveals the microscopic dynamics underlying soft vibrational modes in a ferroelectric material, providing inroads to all-optical control of nonlinear functional materials.


Nonresonant coherent control: Intersubband excitations manipulated by a nonresonant terahertz pulse
We present an approach for controlling quantum coherences in condensed matter by interaction with a nonresonant optical control field. Coherent intersubband (IS) excitations of electrons in
THz-driven nonlinear intersubband dynamics in quantum wells.
This work demonstrates the direct observation of non-equilibrium intersubband dynamics in a modulation-doped multiple quantum well sample induced by intense terahertz pulses, which allows the phase-locked coupling of adjacent intersub band transitions.
Terahertz saturable absorbers from liquid phase exfoliation of graphite
The fabrication of THz SAs by transfer coating and inkjet printing single and few-layer graphene films prepared by liquid phase exfoliation of graphite pave the way to the integration of graphene-based SA with electrically pumped THz semiconductor micro-sources, providing unprecedented compactness and resolution.
Dynamics of ultra-broadband terahertz quantum cascade lasers for comb operation.
It is found that when the phase-noise is large, the laser operates in an unstable regime where the lasing modes are incoherent, and under RF modulation of the laser current such instability can be suppressed and the modes coherence recovered, while, simultaneously, generating a strong broadening of the THz emission spectrum.
Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves.
A demonstration of two-dimensional (2D) terahertz magnetic resonance spectroscopy using the magnetic fields of two time-delayed THz pulses to directly reveal the nonlinear responses of collective spin waves (magnons) in a canted antiferromagnetic crystal.
5-ps-long terahertz pulses from an active-mode-locked quantum cascade laser
A significant research effort toward the generation of short terahertz (THz) pulses using quantum cascade lasers (QCLs) has been undertaken over the past few years. This is motivated by the desire to
Nonperturbative interband response of a bulk InSb semiconductor driven off resonantly by terahertz electromagnetic few-cycle pulses.
Simulations based on a model of a two-level quantum system demonstrate that in spite of the strongly off-resonant character of the excitation the high-field few-cycle pulses drive the interband resonances into a nonperturbative regime of Rabi flopping.
Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser
Dispersion compensation is vital for the generation of ultrashort and single cycle pulses from modelocked lasers across the electromagnetic spectrum. It is typically based on addition of an extra
Generating ultrafast pulses of light from quantum cascade lasers
The generation of ultrashort pulses from quantum cascade lasers (QCLs) has proved to be challenging. It has been suggested that the ultrafast electron dynamics of these devices is the limiting factor
Semiconductor saturable absorbers for ultrafast terahertz signals
We demonstrate saturable absorber behavior of n-type semiconductors GaAs, GaP, and Ge in the terahertz (THz) frequency range at room temperature using nonlinear THz spectroscopy. The saturation