Spontaneous emission of electric and magnetic dipoles in the vicinity of thin and thick metal.
Spontaneous emission of electric and magnetic dipoles in the vicinity of thin and thick metal.
复制标题
薄金属和厚金属附近电偶极子和磁偶极子的自发发射。
DOI：
10.1364/oe.22.007744
复制
发表时间：
2013
期刊：
影响因子：
3.8
通讯作者：
M. Durach
中科院分区：
文献类型：
--
作者：
R. Hussain;D. Keene;N. Noginova;M. Durach
在显微镜装置中分别对电偶极跃迁和磁偶极跃迁清楚地显示了放置在薄和厚的金和银膜附近的Eu（3+）离子的自发辐射的强烈修改。我们已经表明，磁性转变是非常敏感的金衬底的厚度，并表现出明显不同的电过渡。理论上描述的观测分层介质的并矢绿色函数的方法的基础上，并解释通过修改后的图像模型的近场和远场发射。我们建立了存在一个“近场事件视界”，它划分了距离的金属在偶极子发射是专门采取了在近场。
Strong modification of spontaneous emission of Eu(3+) ions placed in close vicinity to thin and thick gold and silver films was clearly demonstrated in a microscope setup separately for electric and magnetic dipole transitions. We have shown that the magnetic transition was very sensitive to the thickness of the gold substrate and behaved distinctly different from the electric transition. The observations were described theoretically based on the dyadic Green's function approach for layered media and explained through modified image models for the near and far-field emissions. We established that there exists a "near-field event horizon", which demarcates the distance from the metal at which the dipole emission is taken up exclusively in the near field.