摘要
本文用量子场方法研究了半无限双原子离子晶体长波光学声子模(P-极化)和平行表面传播的电磁场相互作用系统。导出了表面电磁耦合场量子的色散关系和电场强度在R空间的分布,其色散曲线(表面Polariton部分)与宏观电磁理论结果一致,并可获得由具表面效应的体TO声子引起的漏模色散关系;还研究了电磁耦合场量子能量和场强沿Z向的分布,发现它们均受物质电磁性元激发Z向特性的调制,从而束缚了光的发射(衍射效应).
The interaction system of the long-wave optical modes (P-Polarization) in a semi-infinite diatomic ionic crystal with the electromagnetic field propagating parallel to the surface is studied using quantum field theory methods. The dispersion relations of surface phonon-polaritons and k(?)-dependence of the electric field strength are derived, which consist with the macroscopic theoretical results. The dispersion relation of polariton leaking modes coming from bulk TO mode with surface effect is also presented. The spatial dependence of the polariton field strength and energy are studied and it is found that these properties are modulated by the longitudinal oharaoter of the electromagnetic excitations in the medium, hence the divergent nature (the diffraotion effect) of light propagating along the waveguide is restrained.
出处
《红外研究》
CSCD
北大核心
1989年第2期89-96,共8页
基金
中国自然科学基金
