Electromagnetic diffraction radiation of a subwavelength-hole array excited by an electron beam.
Electromagnetic diffraction radiation of a subwavelength-hole array excited by an electron beam.
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DOI：
10.1103/physreve.80.036602
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Shenggang Liu;Min Hu;Yaxin Zhang;Yuebao Li;R. Zhong
中科院分区：
文献类型：
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作者：
Shenggang Liu;Min Hu;Yaxin Zhang;Yuebao Li;R. Zhong
本文研究了平行于亚波长孔阵列运动的电子束线电荷产生的一组倏逝波激发亚波长孔阵列的电磁衍射辐射的物理性质。由均匀移动的线电荷激活，会发生许多物理现象，例如阵列两侧的衍射辐射以及通过孔在截止线以下或以上的电磁穿透或传输。结果，亚波长孔阵列成为辐射阵列。利用积分方程和相应的绿色函数，建立了这种辐射系统的解析理论。基于该理论的数值计算结果与计算机模拟结果吻合较好。揭示了有效表面等离子体波与电磁场的穿透或透射以及衍射辐射之间的关系。详细研究了孔厚对衍射辐射和电磁穿透或透射的能量依赖性和影响。因此，发现了一种明显的衍射辐射现象。
This paper explores the physics of the electromagnetic diffraction radiation of a subwavelength holes array excited by a set of evanescent waves generated by a line charge of electron beam moving parallel to the array. Activated by a uniformly moving line charge, numerous physical phenomena occur such as the diffraction radiation on both sides of the array as well as the electromagnetic penetration or transmission below or above the cut-off through the holes. As a result the subwavelength holes array becomes a radiation array. Making use of the integral equation with relevant Green's functions, an analytical theory for such a radiation system is built up. The results of the numerical calculations based on the theory agree well with that obtained by the computer simulation. The relation among the effective surface plasmon wave, the electromagnetic penetration or transmission of the holes and the diffraction radiation is revealed. The energy dependence of and the influence of the hole thickness on the diffraction radiation and the electromagnetic penetration or transmission are investigated in detail. Therefore, a distinct diffraction radiation phenomenon is discovered.