Smith-Purcell radiation from rough surfaces
Smith-Purcell radiation from rough surfaces
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DOI：
10.1103/physrevstab.13.070705
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发表时间：
2010-05
影响因子：
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通讯作者：
Z. Gevorkian
中科院分区：
文献类型：
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作者：
Z. Gevorkian
gevork@yerphi.am（日期：2010 年 10 月 12 日）摘要考虑平行于不均匀表面移动的带电粒子的辐射。在单个形式主义中检查周期性和随机光栅。对于周期性不均匀表面，我们推导出色散关系和光谱角强度的新表达式。特别是，对于给定的观察方向，会发射两个波长，而不是标准史密斯-珀塞尔效应的一个波长。对于粗糙表面，我们表明对辐射强度的主要贡献是由两种介质之间的界面上感应的表面极化子给出的。这些极化子在表面的粗糙度上多次散射并转换为真实的光子。计算了光谱角强度并揭示了其对不同参数的依赖性。
gevork@yerphi.am(Dated: October 12, 2010)AbstractRadiation of a charged particle moving parallel to a inhomogeneous surface is considered. Withina single formalism periodic and random gratings are examined. For the periodically inhomogeneoussurface we derive new expressions for the dispersion relation and the spectral-angular intensity. Inparticular, for a given observation direction two wavelengths are emitted instead of one wavelengthof the standard Smith-Purcell effect. For a rough surface we show that the main contribution tothe radiation intensity is given by surface polaritons induced on the interface between two media.These polaritons are multiply scattered on the roughness of surface and convert into real photons.The spectral-angular intensity is calculated and its dependence on different parameters is revealed.