Tunable surface plasmon instability leading to emission of radiation

被引:19
|
作者
Gumbs, Godfrey [1 ,2 ]
Iurov, Andrii [1 ,3 ]
Huang, Danhong [4 ]
Pan, Wei [5 ]
机构
[1] CUNY Hunter Coll, Dept Phys & Astron, 695 Pk Ave, New York, NY 10065 USA
[2] Donostia Int Phys Ctr, San Sebastian 20018, Basque Country, Spain
[3] Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA
[4] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA
[5] Sandia Natl Labs, Albuquerque, NM 87185 USA
关键词
INFRARED TRANSMISSION SPECTRA; LATERALLY CONFINED 2D-PLASMA; 2-DIMENSIONAL PLASMA; DIELECTRIC FUNCTION; QUANTUM; INVERSION; GRAPHENE; ABSORPTION; MODES;
D O I
10.1063/1.4927101
中图分类号
O59 [应用物理学];
学科分类号
摘要
We propose a new approach for energy conversion from a dc electric field to tunable terahertz emission based on hybrid semiconductors by combining two-dimensional (2D) crystalline layers and a thick conducting material with possible applications for chemical analysis, security scanning, medical (single-molecule) imaging, and telecommunications. The hybrid nano-structure may consist of a single or pair of sheets of graphene, sificene, or a 2D electron gas. When an electric current is passed through a 2D layer, we discover that two low-energy plasmon branches exhibit a characteristic loop in their dispersion before they merge into an unstable region beyond a critical wave vector q(c). This finite q(c) gives rise to a wavenumber cutoff in the emission dispersion of the surface plasmon induced instability and emission of radiation (spiler). However, there is no instability for a single driven layer far from the conductor, and the instability of an isolated pair of 2D layers occurs without a wavenumber cutoff. The wavenumber cutoff is found to depend on the conductor electron density, layer separation, distances of layers from the conductor surface, and the driving-current strength. (C) 2015 AIP Publishing LLC,
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页数:10
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