Directional light emission by electric and magnetic dipoles near a nanosphere: an analytical approach based on the generalized Mie theory

作     者：Yao, Kan Zheng, Yuebing 

作者机构：Univ Texas Austin Walker Dept Mech Engn Austin TX 78712 USA Univ Texas Austin Texas Mat Inst Austin TX 78712 USA 

出 版 物：《OPTICS LETTERS》 (光学快报)

年 卷 期：2021年第46卷第2期

页      面：302-305页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Institute of General Medical Sciences [DP2GM128446] 

主　　题：Emission Light matter interactions Mie resonances Mie theory Optical antennas Purcell effect 

摘      要：We present a theoretical study of directional light emission by dipole emitters near a spherical nanoparticle. Our analysis is extended from an exact electrodynamical approach for solving the coupling between a dipole and a sphere, providing a full picture of the directional emission for a complete set of combinations of variable emitters, particles, and their orientations. In particular, we show that the Mie resonances of a dielectric sphere are strongly influenced by the coupled dipole emitter, leading to the scattering properties that are different from the prediction by the standard Mie theory. Moreover, we demonstrate that the dielectric spheres have opposite effects on the emission direction and a decay rate of electric and magnetic dipoles. Our approach enriches the analytical toolbox for designing optical antennas and understanding dipole-sphere coupling. (C) 2021 Optical Society of America