We demonstrate an efficient intracavity nonlinear interaction of laser modes in a specially adapted quantum cascade laser. A two-wavelength quantum cascade laser structure emitting at wavelengths of 7.1 and 9.5 micrometer included cascaded resonant optical intersubband transitions in an intracavity configuration leading to resonantly enhanced sum-frequency and second-harmonic generation at wave...

The spin filtering effect in the bilayer nanowire with quantum point contact is investigated theoretically. We demonstrate the new mechanism of the spin filtering based on the lateral inter-subband spin-orbit coupling, which for the bilayer nanowires has been reported to be strong. The proposed spin filtering effect is explained as the joint effect of the Landau-Zener intersubband transitions c...

We present the first evidence for a distinct optical phonon progression in the linear and nonlinear intersubband absorption spectra of electrons in a GaN/Al(0.8)Ga(0.2)N heterostructure. Femtosecond two-color pump-probe experiments in the midinfrared reveal spectral holes on different vibronic transitions separated by the LO-phonon frequency. These features wash out with a decay time of 80 fs d...

In our work we probe the conduction intersubband transition of an undoped GaAs/Al0.34Ga0.66As multiple quantum well via broadband terahertz pulses after resonant photoexcitation at the 1s heavy-hole exciton. The pump-induced change in the transmitted terahertz field shows a strong beating. In the frequency domain this results in an asymmetric Fano-like line shape for the intersubband resonance ...

Nonlinear metasurfaces based on coupling a locally enhanced plasmonic response to intersubband transitions of n-doped multi-quantum-wells (MQWs) can provide second-order susceptibilities orders of magnitude larger than any other nonlinear flat structure measured so far. Here we present a comprehensive theory to characterize the electromagnetic response of nonlinear processes occurring in ultrat...

We report on the impulsive excitation and control of intersubband and hybrid intersubband-cyclotron modes in a twodimensional electron gas by ultrafast optical pulses. Pump-probe experiments were performed in the reflection geometry on a modulation-doped GaAs/AlxGa1KxAs quantum well at 7 K. Using a pulse shaper to produce multiple excitation pulses, we demonstrate coherent control of charge-den...

%'e calculate the lifetime of a nonequilibrium electron in the first excited subband in the lowdensity heterostructure where this photocreated carrier occurs at the last stage of its cooling. The electron interaction with acoustic phonons gives the dominant intersubband relaxation mechanism, if the intersubband energy splitting and the Fermi energy splitting are relatively small, 1 ) e&/Azo ) 0...

We show theoretically that electromagnetic waves propagating in the transparency region of a noncentrosymmetric medium can induce DC electric current. The origin effect is Raman scattering light by free carriers system. Due to photon scattering, electrons undergo real quantum transitions resulting formation their anisotropic momentum distribution and shifts electronic wave packets giving rise s...

We study the linear intersubband absorption spectra of a 15nm InAs quantum well using the intersubband semiconductor Bloch equations with a three-subband model and a constant dephasing rate. We demonstrate the evolution of intersubband absorption spectral line shape as a function of temperature and electron density. Through a detailed examination of various contributions, such as the phase spac...