Strong-Field Terahertz Control of Plasmon Induced Opacity in Photoexcited Metamaterial
Autor: | Ali Mousavian, Milo X. Sprague, Yun-Shik Lee, Byounghwak Lee, Zachary J. Thompson, Alden N. Bradley |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Physics
Opacity business.industry Scattering Terahertz radiation Metamaterial FOS: Physical sciences Physics::Optics Statistical and Nonlinear Physics 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Split-ring resonator 0103 physical sciences Femtosecond Physics::Atomic and Molecular Clusters Optoelectronics business Ultrashort pulse Plasmon Optics (physics.optics) Physics - Optics |
Popis: | A terahertz metamaterial consisting of radiative slot antennas and subradiant complementary split-ring resonators exhibits plasmon induced opacity in a narrow spectral range due to the destructive interference between the bright and dark modes of the coupled oscillators. Femtosecond optical excitations instantly quench the mode coupling and plasmon oscillations, injecting photocarriers into the metamaterial. The plasmon resonances in the coupled metamaterial are transiently restored by intense terahertz pulses. The strong terahertz fields induce intervalley scattering and interband tunneling of the photocarries, and achieve significant reduction of the photocarrier mobility. The ultrafast dynamics of the nonlinear THz interactions reveals intricate interplay between photocarriers and plasmon oscillations. The high-field THz control of the plasmon oscillations implies potential applications to ultrahigh-speed plasmonics. 5 pages, 4 figures |
Databáze: | OpenAIRE |
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