Mackowski Sebastian, Wörmke Stephan, Maier Andreas J, Brotosudarmo Tatas H P, Harutyunyan Hayk, Hartschuh Achim, Govorov Alexander O, Scheer Hugo, Bräuchle Christoph
Department of Chemistry and Biochemistry and Center for Nanoscience, Ludwig-Maximilian-University, Butenandtstrasse 11, D-81377 Munich, Germany.
Nano Lett. 2008 Feb;8(2):558-64. doi: 10.1021/nl072854o. Epub 2007 Dec 22.
Ensemble and single-molecule spectroscopy demonstrates that both emission and absorption of peridinin-chlorophyll-protein photosynthetic antennae can be largely enhanced through plasmonic interactions. We find up to 18-fold increase of the chlorophyll fluorescence for complexes placed near a silver metal layer. This enhancement, which leaves no measurable effects on the protein structure, is observed when exciting either chlorophyll or carotenoid and is attributed predominantly to an increase of the excitation rate in the antenna. The enhancement mechanism comes from plasmon-induced amplification of electromagnetic fields inside the complex. This result is an important step toward applying plasmonic nanostructures for controlling the optical response of complex biomolecules and improving the design and functioning of artificial light-harvesting systems.
集成光谱和单分子光谱表明，通过等离子体相互作用，多甲藻叶绿素蛋白光合天线的发射和吸收都可以得到显著增强。我们发现，置于银金属层附近的复合物的叶绿素荧光增强了18倍。这种增强对蛋白质结构没有可测量的影响，在激发叶绿素或类胡萝卜素时都能观察到，主要归因于天线中激发速率的增加。增强机制源于复合物内部等离子体诱导的电磁场放大。这一结果是朝着应用等离子体纳米结构来控制复杂生物分子的光学响应以及改进人工光捕获系统的设计和功能迈出的重要一步。
