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The plasmon modes lacking the inversion symmetry can be excited by terahertz radiation on a noncentrosymmetric plasmonic metasurface formed by a two-dimensional electron system gated by a metal grating with an asymmetric unit cell. Excitation of the noncentrosymmetric plasmon mode leads to the terahertz rectification by generating a plasmon-photogalvanic current in the two-dimensional electron system...
We propose InAlAs/InGaAs/InP high electron mobility transistors with an asymmetric chirped dual-grating-gate structure which greatly enhances plasmon instabilities. The fabricated device demonstrates an intense stimulated emission of terahertz monochromatic radiation at cryogenic temperatures for the first time.
We predict strong amplification of terahertz radiation by the stimulated generation of plasmons in a planar array of graphene micro/nanocavities. Amplification drastically enhances due to lateral and vertical confinement of the plasmons in graphene micro/nanocavities and superradiant nature of electromagnetic radiation from the array.
We demonstrate an intense stimulated emission of 0.1–1-μW terahertz (THz) monochromatic radiation in InP-based asymmetric chirped dual-grating-gate (AC-DGG) high electron mobility transistors (HEMTs) at 140–290K. In the research of modern THz electronics, development of compact, tunable and coherent sources operating in the THz regime is one of the hottest issues. Hydrodynamic nonlinearities of two-dimensional...
We designed and fabricated InP-based high electron mobility transistors featuring an asymmetric chirped dual-grating-gate structure with a resonant-enhanced photonic vertical cavity. The device structure greatly enhances the Doppler-effect-driven plasma instability, resulting in intense monochromatic superradiant terahertz emission at 3.55 THz at 140K for the first time.
Physics of plasma oscillations and basic principles of plasmonic detection of terahertz radiation in the grating-gate transistor structures with two-dimensional electron channels are considered. It is shown that the grating-gate-transistor plasmonic detectors can be efficiently coupled to terahertz radiation. Plasmonic detection response considerably increases if the electron density in the grating-gate...
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