Drifting plasmons in open two-dimensional channels: modal analysis
Drifting plasmons in open two-dimensional channels: modal analysis
复制标题
开放二维通道中的等离子体激元漂移：模态分析
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
O. Sydoruk
中科院分区：
文献类型：
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作者：
O. Sydoruk
了解二维通道中等离子体激元的特性对于开发太赫兹产生方法非常重要。本文提出了支持直流电流的开放通道中等离子体反射的模态分析。如图所示，如果直流电流远离导电边界，等离子体激元可以在反射时被放大。相反的电流方向会发生去放大。该问题基于扰动计算进行解析求解，并通过数值求解，并证明了两种方法之间的一致性。发现通道辐射的功率可以忽略不计，并且开放通道中的等离子体反射与封闭通道中的等离子体反射相似。基于这种相似性，早期为封闭通道开发的振荡器设计也适用于开放通道。研究结果进一步发展了模态分解技术，作为太赫兹等离子体源设计的工具。
Understanding the properties of plasmons in two-dimensional channels is important for developing methods of terahertz generation. This paper presents a modal analysis of plasmonic reflection in open channels supporting dc currents. As it shows, the plasmons can be amplified upon reflection if a dc current flows away from a conducting boundary; de-amplification occurs for the opposite current direction. The problem is solved analytically, based on a perturbation calculation, and numerically, and agreement between the methods is demonstrated. The power radiated by a channel is found to be negligible, and plasmon reflection in open channels is shown to be similar to that in closed channels. Based on this similarity, the oscillator designs developed earlier for closed channels could be applicable also for open ones. The results develop the modal-decomposition technique further as an instrument for the design of terahertz plasmonic sources.