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arXiv 1410.7813cond-mat.mes-hallcond-mat.mtrl-sci
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导致辐射发射的表面等离子体不稳定性

Surface Plasmon Instability Leading to Emission of Radiation

Godfrey Gumbs, Andrii Iurov, Danhong Huang, Wei Pan

摘要:

我们提出了一种新的能量转换方法,从直流电场的太赫兹波的基础上混合半导体相结合的二维(2D)的晶体层和厚的导电材料与可能的应用程序作为一个源的相干辐射。混合纳米结构可以由单个或成对的石墨烯、硅烯或2D电子气的片组成,如将在半导体异质界面处出现的。当电流通过一个层时,我们发现低频等离子体激元可能会变得不稳定超过一个临界波矢$q_c$。然而,对于远离导体的单个驱动层没有不稳定性,并且隔离的2D层对的不稳定性仅发生在超长波长处。为了使该自发辐射的频率捷变,我们通过选择导体电子密度、层间隔、层与导体表面的距离和驱动电流强度来操纵表面等离子体激元诱导的不稳定性,其导致辐射的发射(spiler),以在较短波长处发生。Spiler的太赫兹辐射有望应用于化学分析、安全扫描、医学成像和电信。

英文摘要:

We propose a new energy conversion approach from a dc electric field to a terahertz wave based on hybrid semiconductors by combining two-dimensional (2D) crystalline layers and a thick conducting material with possible applications as a source of coherent radiation. The hybrid nano-structure may consist of a single or pair of sheets of graphene, silicene or a 2D electron gas as would occur at a semiconductor hetero-interface. When an electric current is passed through a layer, we discover that the low-frequency plasmons may become unstable beyond a critical wave vector $q_c$. 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 only at ultra long wavelengths. To bring in frequency agility for this spontaneous radiation, we manipulate the surface-plasmon induced instability, which leads to the emission of radiation (spiler), to occur at shorter wavelengths by choosing the conductor electron density, layer separation, distances of layers from the conductor surface and the driving-current strength. Applications of terahertz radiation from spiler for chemical analysis, security scanning, medical imaging and telecommunications are expected.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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