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arXiv 1606.00516physics.chem-ph
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旋转态相关的分子排列对光偶极子力的影响

Effect of rotational-state-dependent molecular alignment on the optical dipole force

Lee Yeong Kim, Ju Hyeon Lee, Hye Ah Kim, Sang Kyu Kwak, Bretislav Friedrich, Bum Suk Zhao

摘要:

基于分子与光场相互作用的分子光学元件(例如透镜或棱镜)的性质在关键方面取决于分子的量子态及其由光场产生的排列。然而,在以前的实验研究中,状态依赖的排列的影响从来没有被包括在估计的光学偶极力作用于分子上,而以前的理论研究采取了状态依赖的分子排列只考虑隐含。在这里,我们认为明确的分子排列的影响,并为此目的,引入一个有效的极化率,适当考虑分子的排列,并直接关系到依赖于光偶极力。我们说明的意义,包括分子排列的光学偶极力的轨迹研究,比较以前使用的近似与本方法。进行了轨迹模拟的线性分子系综的传播或驻波光场的温度和激光强度的范围内。结果表明,依赖于极化率的有效极化率可以提供正确的估计的光学偶极子力,在此基础上,适用于非极性分子的状态选择方法可以基于。我们注意到,一个类似的分析力作用在极性分子受到不均匀的静态电场揭示了类似的强烈依赖于分子取向。

英文摘要:

The properties of molecule-optical elements such as lenses or prisms based on the interaction of molecules with optical fields depend in a crucial way on the molecular quantum state and its alignment created by the optical field. However, in previous experimental studies, the effects of state-dependent alignment have never been included in estimates of the optical dipole force acting on the molecules while previous theoretical investigations took the state-dependent molecular alignment into account only implicitly. Herein, we consider the effects of molecular alignment explicitly and, to this end, introduce an effective polarizability which takes proper account of molecular alignment and is directly related to the alignment-dependent optical dipole force. We illustrate the significance of including molecular alignment in the optical dipole force by a trajectory study that compares previously used approximations with the present approach. The trajectory simulations were carried out for an ensemble of linear molecules subject to either propagating or standing-wave optical fields for a range of temperatures and laser intensities. The results demonstrate that the alignment-dependent effective polarizability can serve to provide correct estimates of the optical dipole force, on which a state-selection method applicable to nonpolar molecules could be based. We note that an analogous analysis of the forces acting on polar molecules subject to an inhomogeneous static electric field reveals a similarly strong dependence on molecular orientation.

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