Electron-beam instability in left-handed media.
Electron-beam instability in left-handed media.
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DOI：
10.1103/physrevlett.100.244803
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发表时间：
2008-04
影响因子：
8.6
通讯作者：
Y. Bliokh;S. Savel’ev;F. Nori
中科院分区：
文献类型：
--
作者：
Y. Bliokh;S. Savel’ev;F. Nori
我们预测两束电子束在穿过左手介质（LHM）板时会产生不稳定性。这种不稳定性仅是 LHM 所固有的，源自向后的切伦科夫辐射，并导致光束的自调制和电磁波的辐射。这些波通过板的后表面（光束注入平面）离开样品，并形成两个以光束为中心的移位的明亮圆圈。模拟的辐射光谱在宽阔的连续光谱之上具有分离良好的线条，这表明系统中存在动态混沌。辐射强度及其光谱可以通过光束的电流或两个光束之间的距离来控制。
We predict that two electron beams can develop an instability when passing through a slab of left-handed media (LHM). This instability, which is inherent only for LHM, originates from the backward Cherenkov radiation and results in a self-modulation of the beams and radiation of electromagnetic waves. These waves leave the sample via the rear surface of the slab (the beam injection plane) and form two shifted bright circles centered at the beams. A simulated spectrum of radiation has well-separated lines on top of a broad continuous spectrum, which indicates dynamical chaos in the system. The radiation intensity and its spectrum can be controlled either by the beams' current or by the distance between the two beams.