Terahertz radiation from graphene surface plasmon polaritons
Terahertz radiation from graphene surface plasmon polaritons
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DOI：
10.1109/irmmw-thz.2016.7758931
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
D. Li;Y. Wang;M. Nakajima;M. Hashida;Y. Wei;S. Miyamoto;M. Tani
中科院分区：
文献类型：
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作者：
D. Li;Y. Wang;M. Nakajima;M. Hashida;Y. Wei;S. Miyamoto;M. Tani
提出了一种从电子束在均匀石墨烯结构表面激发的表面等离子体激元中提取太赫兹辐射的方法。提出了一种侧壁结构来提升表面等离子体激元模，使其靠近光线，从而使其一些谐波有机会超过光线并成为辐射。谐波被认为是由一列周期性的电子聚束激发的。用三维理论分析了其物理机制，并通过数值计算论证了谐波的激发和辐射。
A method to extract terahertz radiation from surface plasmon polaritons excited in the surface of a uniform graphene structure by an electron beam is presented. A sidewall configuration is proposed to lift the surface plasmon mode to be close to the light line, so that some of its harmonics have chances to go above the light line and become radiative. The harmonics are considered to be excited by a train of periodic electron bunches. The physical mechanism is analyzed with three-dimensional theory, and the harmonics excitation and radiation are demonstrated through numerical calculations.