通过控制光子态密度调节生物系统中的自发发射与Forster能量转移
Tuning Spontaneous Emission versus Forster Energy Transfer in Biological Systems by Manipulating the Density of Photonic States
摘要：
我们从理论上讨论了如何以连续和非破坏性的方式调节福斯特转移和自发发射之间的竞争。所提出的方法特别适合于精细的生物系统，如光捕获复合物和荧光蛋白寡聚体。我们证明了在能量供体的发射频率处的光子态密度的操纵导致竞争能量转移和自发发射过程的量子效率的改变。这种变化将表现在供体和受体发射强度的改变中。因此，通过控制光子态的局部密度，可以操纵和分析福斯特耦合系统，而不需要物理分离供体和受体发色团进行单独的分析，这是感兴趣的，例如，低聚珊瑚礁荧光蛋白。
英文摘要：
We theoretically discuss how to tune the competition between Forster transfer and spontaneous emission in a continuous and nondestructive fashion. The proposed approach is especially suitable for delicate biological systems like light harvesting complexes and fluorescent protein oligomers. We demonstrate that the manipulation of the density of photonic states at the emission frequency of the energy donor results in a change of the quantum efficiencies of the competing energy transfer and spontaneous emission processes. This change will be manifested in a modification of the donor and acceptor emission intensities. Thus, by controlling the local density of photonic states Forster coupled systems can be manipulated and analyzed without the need to physically separate donor and acceptor chromophores for individual analysis, which is of interest, for example, for oligomeric reef coral fluorescent proteins.
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