Generation Of High-Power Terahertz Radiation By Nonlinear Photon-Assisted Tunneling Transport In Plasmonic Metamaterials
JOURNAL OF OPTICS(2017)
摘要
We propose an optoelectronic terahertz oscillator based on the quantum tunneling effect in a plasmonic metamaterial, utilizing a nanostructured metal-insulator-metal (MIM) tunneling junction. The collective resonant response of meta-atoms can achieve >90% optical absorption and strongly localized optical fields within the MIM plasmonic nanojunction. By properly tailoring the radiation aperture, the nonlinear quantum conductance induced by the metamaterial-enhanced, photon-assisted tunneling may produce miliwatt-level terahertz radiation through the optical beating (or heterodyne down conversion) of two lasers with a slight frequency offset. We envisage that the interplay between photon-assisted tunneling and plasmon coupling within the MIM metamaterial/diode may substantially enhance the modulated terahertz photocurrent, and may therefore realize a practical high-power, room-temperature source in applications of terahertz electronics.
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关键词
nonlinear optics,photomixing,terahertz waves,metamaterials,multiphoton-assisted tunneling,quantum plasmonics,optical heterodyne
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