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arXiv 0904.2662physics.opticsphysics.plasm-ph
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半无限等离子体和等离子体板中的等离子体激元和极化激元

Plasmons and polaritons in a semi-infinite plasma and a plasma slab

M. Apostol, G. Vaman

摘要:

等离子体激元和极化激元模式,推导出一个理想的半无限(半空间)等离子体和一个理想的等离子体板通过使用一个通用的,统一的程序,基于运动方程,麦克斯韦方程组和适当的边界条件。已知的结果重新获得更直接的方式和新的推导。该方法包括通过移动粒子(电子)位置处的位移场来表示电荷扰动。计算了介电响应和电子能量损失。表面对能量损失的贡献在表面附近的瞬态区域表现出振荡行为。通过使用延迟的电磁势来处理电磁波在这些等离子体中的传播。求解所得积分方程,计算反射波和折射波以及反射系数。对于平板,我们还计算了透射波和透射系数。从而得到了任意入射角和偏振态下的广义菲涅耳关系。体和表面等离子体极化激元模式被确定。众所周知,等离子体内部的场要么是衰减的(渐逝的)要么是传播的(透明区),并且半无限等离子体的反射系数在从传播区到衰减区时表现出突然的增强(全反射)。同样,除了特征振荡,反射和透射系数的等离子体板表现出明显的增强阻尼制度。

英文摘要:

Plasmon and polariton modes are derived for an ideal semi-infinite (half-space) plasma and an ideal plasma slab by using a general, unifying procedure, based on equations of motion, Maxwell's equations and suitable boundary conditions. Known results are re-obtained in much a more direct manner and new ones are derived. The approach consists of representing the charge disturbances by a displacement field in the positions of the moving particles (electrons). The dielectric response and the electron energy loss are computed. The surface contribution to the energy loss exhibits an oscillatory behaviour in the transient regime near the surfaces. The propagation of an electromagnetic wave in these plasmas is treated by using the retarded electromagnetic potentials. The resulting integral equations are solved and the reflected and refracted waves are computed, as well as the reflection coefficient. For the slab we compute also the transmitted wave and the transmission coefficient. Generalized Fresnel's relations are thereby obtained for any incidence angle and polarization. Bulk and surface plasmon-polariton modes are identified. As it is well known, the field inside the plasma is either damped (evanescent) or propagating (transparency regime), and the reflection coefficient for a semi-infinite plasma exhibits an abrupt enhancement on passing from the propagating regime to the damped one (total reflection). Similarly, apart from characteristic oscillations, the reflection and transmission coefficients for a plasma slab exhibit an appreciable enhancement in the damped regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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