标题： 光合捕光复合体之间从强耦合到弱耦合区域的高效腔介导能量转移 显示英文标题

标题： Efficient cavity-mediated energy transfer between photosynthetic light harvesting complexes from strong to weak coupling regime

摘要： 光合捕光复合体之间的激发能转移对于高效的初级光合作用至关重要。 控制这一过程是推动新兴人工光合成系统发展的关键。 在这里，我们实验上展示了通过法布里-珀罗光学微腔介导的光合捕光2复合体（LH2）之间的增强激发能转移。 使用强度依赖的泵浦-探测光谱学，我们分析了由于跨LH2能量转移引起的激子-激子湮灭（EEA）。 比较腔样品中LH2和裸露LH2薄膜中的EEA，我们观察到腔中EEA的增强，表明通过耦合到共同腔模式改善了激发能转移。 令人惊讶的是，这种效应甚至在弱耦合区域仍然存在。 增强效果归因于共振光学微腔引入的LH2之间的额外连通性。 我们的结果表明，光学微腔可以成为修改分子复合体之间激发能转移的战略工具，为高效人工光捕获提供了一种有前景的方法。 显示英文摘要

摘要： Excitation energy transfer between photosynthetic light-harvesting complexes is vital for highly efficient primary photosynthesis. Controlling this process is the key for advancing the emerging artificial photosynthetic systems. Here, we experimentally demonstrate the enhanced excitation energy transfer between photosynthetic light-harvesting 2 complexes (LH2) mediated through the Fabry-Perot optical microcavity. Using intensity-dependent pump-probe spectroscopy, we analyse the exciton-exciton annihilation (EEA) due to inter-LH2 energy transfer. Comparing EEA in LH2 within cavity samples and the bare LH2 films, we observe enhanced EEA in cavities indicating improved excitation energy transfer via coupling to a common cavity mode. Surprisingly, the effect remains even in the weak coupling regime. The enhancement is attributed to the additional connectivity between LH2s introduced by the resonant optical microcavity. Our results suggest that optical microcavities can be a strategic tool for modifying excitation energy transfer between molecular complexes, offering a promising approach towards efficient artificial light harvesting.