螺旋结构附近的Purcell因子和Forster共振能量转移
Purcell factors and Forster resonance energy transfer in proximity to helical structures
摘要：
当发射体被放置在金属或晶体结构附近时，自发发射和共振能量转移都可以显著增强。这种增强可以使用电磁格林张量来描述，并且由结构的主导表面模式来确定。在这里，我们使用本征介电常数的形式主义，推导出自发发射和FRET率在准静态制度中的两个组成部分的介质与各向异性夹杂。然后，我们将我们的研究结果应用到螺旋结构，支持同步振动，并评估这些模式，这是与一个强大的和离域的响应的贡献。我们发现，这种贡献可以导致大的Purcell因子和长范围的FRET，它与螺旋螺距振荡。这些发现可能对理解和控制接近螺旋结构（如微管）的分子之间的相互作用有影响。
英文摘要：
Both spontaneous emission and resonant energy transfer can be enhanced significantly when the emitter is placed in the vicinity of metallic or crystal structures. This enhancement can be described using the electromagnetic Green tensor and is determined by the dominant surface modes of the structure. Here we use the eigenpermittivity formalism to derive the spontaneous emission and FRET rates in the quasistatic regime in a two-constituent medium with an anisotropic inclusion. We then apply our results to a helical structure supporting synchronous vibrations and evaluate the contribution of these modes, which are associated with a strong and delocalized response. We show that this contribution can result in large Purcell factors and long-range FRET, which oscillates with the helix pitch. These findings may have implications in understanding and controlling the interactions of molecules close to helical structures such as the microtubules.
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