物理
领域(数学)
激发
偶极子
横截面
纵向磁场
梁(结构)
原子物理学
光学
分子物理学
磁场
量子力学
数学
结构工程
工程类
纯数学
作者
Lukas Novotny,Michael R. Beversluis,Kathleen S. Youngworth,Thomas G. Brown
标识
DOI:10.1103/physrevlett.86.5251
摘要
We demonstrate that a strong longitudinal, nonpropagating field is generated at the focus of a radially polarized beam mode. This field is localized in space and its energy density exceeds the energy density of the transverse field by more than a factor of 2. Single molecules with fixed absorption dipole moments are used to probe the longitudinal field. Vice versa, it is demonstrated that orientations of single molecules are efficiently mapped out in three dimensions by using a radially polarized beam as the excitation source. We also show that there is no momentum or energy transport associated with the longitudinal field.
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