表面等离极化激元的散射及波前调控

Scatterings and wavefront manipulations of surface plasmon polaritons

表面等离极化激元在片上信号传输、增强非线性/拉曼效应、生物/化学传感、超分辨成像等方面具有重要应用.在这些应用中,表面等离极化激元的近场传输及远场散射起着重要作用.然而,长期以来人们对相关物理效应缺乏简单有效的理论理解,这也限制了人们对表面等离极化激元的自由调控.本文首先简单回顾了表面等离极化激元的发展历史及现状,接着着重介绍了表面等离极化激元的近场传输效应和远场散射效应,包括其理论进展及其相关应用;最后还介绍了表面等离极化激元的近场波前调控的相关方法.基于这些进展,人们对表面等离极化激元的散射特性有了更为深刻的理解和更加强大的调控能力,这将对未来表面等离极化激元相关研究和应用带来启发.

Surface plasmon polaritons(SPPs)have found many important applications in on-chip signal transportation,enhanced nonlinear/Raman effect,biological/chemical sensing,super resolution imaging,etc.In these applications,the near-field propagation and far-field scattering of SPPs play a vital role.However,there has been strong desire to understand these physical effects.In this paper,we first briefly review the history and progress of SPPs.Next,we mainly focus on the near-field propagation and far-field scattering of SPPs,including their fundamental theories and practical applications.Finally,we review several different approaches to manipulating the near-field wavefronts of SPPs.These researches offer us a more in-depth understanding and the ability to more strongly control the scattering characteristics of SPPs,which may promote the scientific researches and practical applications of SPPs in the future.