摘要
基于均匀线源天线的辐射场,本文介绍了一种长度可控的光针场实现方法。假定均匀线源天线沿光轴对称地安置在4?聚焦系统的焦点上,通过会聚和逆转该天线的辐射场,便可在焦区得到长度可控的光针场。数值结果表明所产生的焦场为纵向极化且横向分布高度局域。我们发现光针长度只取决于均匀线源天线的长度。所设计的光针场在粒子加速、显微与成像等方面具有潜在的应用。
On the basic of the radiation pattern from a uniform line source,we introduce an approach for generating an optical needle field with a controllable length.Through collecting and inversing the radiated field from a uniform line source antenna that is symmetrically located at the focus of a 4 Pi focusing system along the optical axis,the controllable length optical needle at the focal region is readily obtained.Numerical results demonstrate that the created focal field is longitudinally polarized and highly localized in the transversal direction.It is found that the length of an optical needle is only determined by the length of uniform line source antenna.The engineered optical needle may found potential applications in particle acceleration,microscopy,and imaging.
出处
《微波学报》
CSCD
北大核心
2015年第S2期44-47,共4页
Journal of Microwaves
基金
福建省科技厅重点项目(2012H0035)
关键词
光针场
辐射场
均匀线源天线
Optical needle field
radiation field
uniform line source antenna
