Optimal alignment control of a nonpolar molecule through nonresonant multiphoton transitions.
Optimal alignment control of a nonpolar molecule through nonresonant multiphoton transitions.
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DOI：
10.1063/1.3010369
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发表时间：
2008-11
期刊：
影响因子：
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通讯作者：
K. Nakagami;Y. Mizumoto;Y. Ohtsuki
中科院分区：
文献类型：
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作者：
K. Nakagami;Y. Mizumoto;Y. Ohtsuki
利用最优控制模拟方法，对非极性分子系综的取向控制进行了数值研究。采用量子刚性转子模拟氮分子。受控旋转波包是通过极化率耦合引起的非共振光学跃迁产生的。最佳脉冲被设计成在零温度和有限温度的情况下在不存在/存在外部静态场的情况下在指定时间实现对准控制，以及保持对准状态。当选择在指定时间间隔内保持对齐状态作为目标时，控制机制主要归因于动态机制。多个最优的解决方案，导致几乎相同的控制实现，这是一致的拓扑结构的量子控制景观。
Alignment control of an ensemble of nonpolar molecules is numerically studied by means of optimal control simulation. A nitrogen molecule that is modeled by a quantum rigid rotor is adopted. Controlled rotational wave packets are created through nonresonant optical transitions induced by polarizability coupling. Optimal pulses are designed to achieve the alignment control at a specified time in the absence/presence of external static fields in zero- and finite-temperature cases, as well as to maintain an aligned state. When maintaining an aligned state over a specified time interval is chosen as a target, the control mechanism is primarily attributed to a dynamical one. Multiple optimal solutions that lead to virtually the same control achievement are found, which are consistent with the topology of the quantum control landscape.