变化电场作用下Bloch振荡的自发辐射  

Spontaneous Emission of Bloch Oscillation Radiation in an Alternating Electric Filed

作　　者：吴敏珍[1] 

机构地区：[1]烟台大学光电信息科学与技术学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2008年第3期176-180,共5页Journal of Yantai University(Natural Science and Engineering Edition)

摘　　要：研究了随时间变化电场作用下超晶格中电子的自发辐射.对超晶格采用最近邻紧束缚近似模型,在单带最近邻框架内讨论一维系统,推导出辐射几率的函数式.分析了Bloch频率与电场频率比值对于辐射几率的影响.结果表明,可以通过调整Bloch频率与电场频率比值得出较大的辐射几率,从而获得较大功率的THz波源.A theory for the spontaneous emission of radiation for a Bloch electron traversing a single energy band under the influence of an alternating electric field is presented. Spontaneous emission （SE） probabilities are developed and illustrated for nearest-neighbor tight-binding and more realistic superlattice band structure models. The SE probabilities function is deduced, and the influence of the ratio of the Block frequency with the electric field one on the SE probability is studied. The results show that the SE probability depends on the ratio of Bloch frequency with the electric field one, and the power radiated into free space from the SE due to Bloch oscillations in the terahertz frequency range can be enhanced through selecting the appropriate ratio of the Bloch frequency to the electric field one.

关 键 词：BLOCH振荡 THZ波 自发辐射 紧束缚模型 

分 类 号：O469[理学—凝聚态物理]