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    Research

    Plasmonic sources and detectors of THz radiation based on 2d electron systems

    Plasmons in two-dimensional semiconductors can efficiently mediate the generation and detection of THz radiation. Excitation of plasmons in transistor-based THz detectors leads to the resonant character of detection and record-high responsivity as a consequence. The formation of plasma instabilities in nanoelectronic devices with the subsequent conversion of plasmons into free-space electromagnetic waves allows one to create new efficient THz generators.

     

    The laboratory is working on the theory of plasmon instabilities and THz generation in novel two-dimensional materials.

     


    Nanoscale generators of photons and surface plasmons based on resonant tunneling


    The resonant tunneling accompanied by photon emission comprises the operating principle of quantum cascade lasers, which are the most efficient tunable sources of coherent far-infrared radiation. The study of the group is focused on the resonant tunneling in novel van der Waals heterostructures. In these heterostructures, the unique semiconducting properties of graphene and unusual optical properties of transition metal chalcogenides are cooperated. In contrast to the common III-V heterostructures, van der Waals heterostructures allow the generation and coherent amplification of plasmons, which can set the principle of future optoelectronic devices.

     


    Theory of terahertz lasing in narrow-gap semiconductors



    The narrow-gap two-dimensional semiconductors (graphene, mercury cadmium telluride quantum wells) can act as active lasing media, and the frequency range of gain for such media spans from terahertz to the visible waves. The laboratory is working on the theory of terahertz lasing in these materials, including the study of optical gain and absorption, non-radiative recombination and nonequilibrium carrier kinetics.

       

    Optical and terahertz spectroscopy of graphene

    One of the most important research directions of the group is the experimental study of the optical and plasmonic properties of graphene aimed at the creation of graphene-based optoelectronic and plasmonic devices.

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