Theory of unconventional Smith-Purcell radiation in finite-size photonic crystals.
Theory of unconventional Smith-Purcell radiation in finite-size photonic crystals.
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DOI：
10.1364/oe.14.007378
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发表时间：
2006-05
期刊：
影响因子：
3.8
通讯作者：
T. Ochiai;K. Ohtaka
中科院分区：
文献类型：
--
作者：
T. Ochiai;K. Ohtaka
本文证明了电子以超相对论速度在光子晶体附近运动时产生的非常规Smith-珀塞尔辐射（uSPR）。这种现象是不相关的常规SPR的接受机制，并出现，因为从电子的倏逝光有这样一个小的衰减常数在超相对论制度，它实际上作为一个平面波探针进入的PhC从一端。我们分析了SPR光谱对电子速度和激发光子带的奇偶性的依赖关系，并显示，对于由有限数量的圆柱体组成的光子晶体，uSPR探测光子带结构非常忠实。
Unusual emission of light, called the unconventional Smith- Purcell radiation (uSPR) in this paper, was demonstrated from an electron traveling near a finite photonic crystal (PhC) at an ultra-relativistic velocity. This phenomenon is not related to the accepted mechanism of the conventional SPR and arises because the evanescent light from the electron has such a small decay constant in the ultra-relativistic regime that it works practically as a plane-wave probe entering the PhC from one end. We analyze the dependence of the SPR spectrum on the velocity of electron and on the parity of excited photonic bands and show, for PhCs made up of a finite number of cylinders, that uSPR probes the photonic band structure very faithfully.