Plasmon-induced strong interaction between chiral molecules and orbital angular momentum of light.
Plasmon-induced strong interaction between chiral molecules and orbital angular momentum of light.
复制标题
等离子激元诱导手性分子与光轨道角动量之间的强相互作用
DOI：
10.1038/srep18003
复制
发表时间：
2015-12-14
影响因子：
4.6
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Wu T;Wang R;Zhang X
光学轨道角动量(OAM)与手性分子之间是否存在手性相互作用尚无定论。到目前为止，还没有在实验中观察到这种相互作用。在这里，我们提出了一种T矩阵方法来研究光学OAM与纳米粒子簇中的手性分子之间的相互作用。我们发现，手性分子与OAM之间的强相互作用可以由等离子体共振激发而产生。提出了一种观测这种相互作用的实验方案。此外，我们还发现，OAM二色性的信号可以是正的，也可以是负的，这取决于纳米复合材料在OAM光束横截面上的空间位置。空间平均值中正负信号之间的抵消可以解释为什么在以前的实验中没有观察到这种相互作用。
Whether or not chiral interaction exists between the optical orbital angular momentum (OAM) and a chiral molecule remains unanswered. So far, such an interaction has not been observed experimentally. Here we present a T-matrix method to study the interaction between optical OAM and the chiral molecule in a cluster of nanoparticles. We find that strong interaction between the chiral molecule and OAM can be induced by the excitation of plasmon resonances. An experimental scheme to observe such an interaction has been proposed. Furthermore, we have found that the signal of the OAM dichroism can be either positive or negative, depending on the spatial positions of nanocomposites in the cross-sections of OAM beams. The cancellation between positive and negative signals in the spatial average can explain why the interaction has not been observed in former experiments.