Functional Separation of Energy Transfer and Photon Absorption of Excitons Formed in Circular Nanoantennae
Functional Separation of Energy Transfer and Photon Absorption of Excitons Formed in Circular Nanoantennae
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圆形纳米天线中形成的激子的能量转移和光子吸收的功能分离
DOI：
10.1002/pssb.202200206
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Oka Hisaki
中科院分区：
文献类型：
--
作者：
Dai Okamoto;Mitsuru Sometani;Hirohisa Hirai;Mitsuo Okamoto;Tetsuo Hatakeyama;Oka Hisaki
理论上提出了一种有效和快速的能量转移（ET）机制，仅通过模仿天然光合捕光（LH）天线的圆形结构，而没有天然光合系统中的空间和能量紊乱。采用两个B850 LH复合物的光合细菌，它表明，对于接近LH天线的ET率可以优化功能分离ET从激子能级内的光子吸收通过调节LH天线之间的距离在室温下。结果表明，对于相近的LHs，光子吸收和ET这两个过程在能量上和功能上可以在同一激子能级上分开。从温度依赖性的转移率的分析，它也表明，这两个能量分离的过程连接的激子人口的热泵浦和优化的ET率可以在室温下实现时，光学允许和禁止状态之间的能量差是可比的环境的热能。
An efficient and rapid energy transfer (ET) mechanism is theoretically proposed only by mimicking the circular structure of natural photosynthetic light‐harvesting (LH) antennae, without spatial and energetic disorders as in natural photosynthetic systems. Two B850 LH complexes of photosynthetic bacterium are adopted, and it is shown that for close LH antennae the ET rate can be optimized by functionally separating ET from photon absorption within exciton energy levels by an adjustment of the distance between the LH antennae at room temperature. As a result, for close LHs, the two processes of photon absorption and ET can be energetically and functionally divided within the same exciton energy level. From the analysis of the temperature dependence of transfer rate, it is also shown that the two energetically separated processes are connected by thermal pumping of the exciton population and an optimized ET rate can be achieved at room temperature when the energy difference between optically allowed and forbidden states is comparable with the thermal energy of the environment.