نتایج جستجو برای: intersubband transitions
تعداد نتایج: 74833 فیلتر نتایج به سال:
The interaction between intersubband resonances (ISRs) and metamaterial microcavities constitutes a strongly coupled system where new resonances form that depend on the coupling strength. Here we present experimental evidence of strong coupling between the cavity resonance of a terahertz metamaterial and the ISR in a high electron mobility transistor (HEMT) structure. The device is electrically...
Femtosecond midinfrared four-wave mixing is used to study the ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells. Time-integrated four-wave mixing yields a dephasing time of T2 1⁄4 320 fs; independent of excitation density. Time-resolved four-wave mixing unambiguously shows that the intersubband transition is purely homogeneously broad...
III–V semiconductor mid-infrared photodetectors based on intersubband transitions hold great potential for ultra-high-speed operation up to several hundreds of GHz. In this work we exploit a ∼350 nm thick GaAs/Al0.2Ga0.8As multi-quantum-well heterostructure demonstrate heterodyne detection at λ ∼ 10 μm with nearly flat frequency response 70 GHz room temperature, solely limited by the measuremen...
A fiber-optic pump-probe setup is used to demonstrate all-optical switching based on intersubband cross-absorption modulation in GaN/AlN quantum-well waveguides, with record low values of the required control pulse energy. In particular, a signal modulation depth of 10 dB is obtained with control pulse energies as small as 38 pJ. Such low power requirements for this class of materials are mainl...
The theory of weak localization is generalized for multilevel 2D systems taking into account intersubband scattering. It is shown that weak intersubband scattering which is negligible in a classical transport, affects strongly the weaklocalization correction to conductivity. The anomalous magnetoresistance is calculated in the whole range of classically low magnetic fields. This correction to c...
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