Biologically inspired molecular machines driven by light. Optimal control of a unidirectional rotor
Biologically inspired molecular machines driven by light. Optimal control of a unidirectional rotor
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由光驱动的受生物启发的分子机器。
DOI：
10.1088/1367-2630/12/7/075007
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发表时间：
2010
影响因子：
3.3
通讯作者：
T. Seideman
中科院分区：
文献类型：
--
作者：
G. Pérez;A. Pelzer;L. González;T. Seideman
我们调查在何种程度上单向分子内扭转运动可以在一个定向双环模型系统单独由激光驱动。我们通过专门定制的激光脉冲应用量子控制机制来诱导这种运动，从而消除了对分子马达系统中常规使用的热约束步骤的需要。我们的方法不依赖于潜在表面的特定细节来创建首选方向。相反，我们使用物质场相互作用和相干最优控制的工具，在激发的电子表面上的非束缚扭转态之间创建具有非零角动量的波包。控制算法的结果的分析提供了一般洞察最优控制理论何时以及如何可以找到解决方案，不能通过简单的直观方案产生。我们发现，在约束偏振下，控制算法减少到一个简单的直观的相干控制策略，其中第一个IR脉冲在地面上创建一个非平稳波包，随后的UV脉冲将其转移到激发态。然而，考虑到偏振整形，我们发现了超越直观方案的新控制路线。
We investigate the extent to which unidirectional intramolecular torsional motion can be created in an oriented bicyclic model system driven solely by laser light. We apply the machinery of quantum control via specifically tailored laser pulses to induce such motion, eliminating the need for the thermally constrained steps conventionally used in molecular motor systems. Our approach does not rely on specific details of the potential surfaces to create a preferred direction. Rather, we use matter–field interaction and the tools of coherent optimal control to create a wave packet with nonzero angular momentum among unbound torsional states on an excited electronic surface. Analysis of the results of the control algorithm provides general insight into when and how optimal control theory can find solutions that could not be generated through simple intuitive schemes. We find that, under constrained polarization, the control algorithm reduces to a simple intuitive coherent control strategy wherein a first IR pulse creates a non-stationary wave packet on the ground surface and a subsequent UV pulse transfers it to the excited state. Allowing for polarization shaping, however, we find new control routes that go beyond the intuitive scheme.