Longitudinal field modes probed by single molecules

被引：724

作者：

Novotny, L ^{[1
]}

Beversluis, MR ^{[1
]}

Youngworth, KS ^{[1
]}

Brown, TG ^{[1
]}

机构：

[1] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.86.5251

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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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收藏

页码：5251 / 5254

页数：4

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