Longitudinal field modes probed by single molecules
Longitudinal field modes probed by single molecules
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DOI：
10.1103/physrevlett.86.5251
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发表时间：
2001-06-04
影响因子：
8.6
通讯作者：
Brown, TG
中科院分区：
文献类型：
--
作者：
Novotny, L;Beversluis, MR;Brown, TG
我们证明了一个强大的纵向，非传播场产生的径向偏振光束模式的焦点。这个场在空间中是局部化的，并且其能量密度超过横向场的能量密度超过2倍。具有固定吸收偶极矩的单分子被用来探测纵向场。反之亦然，它表明，通过使用径向偏振光束作为激发源，单分子的取向被有效地映射出在三维空间中。我们还表明，没有动量或能量输运与纵向场。
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.