论文标题
差分分子腔模式在软腔中耦合
Differential molecule-cavity mode coupling in soft-cavities
论文作者
论文摘要
分子吸收，传递和发射光的方式可以通过将它们耦合到光腔来显着修饰。修饰的程度通常由腔体偶联强度定义。评估腔体支持的不同类型模式的这种耦合强度对于设计分子腔耦合的空腔至关重要。在这里，我们探测了独特的多模腔，即介电微球，也称为软腔，该腔体支持两种不同类型的模式，深色场散射（DFS）模式和窃窃私图库模式（WGM）。尽管看似相似，但这些模式表现出不同的特征，例如空间电场曲线，共振线宽度等。我们研究了一种单层J-聚集染料分子的单层耦合以及使用两种技术的介电塑料微球，分别产生了远场激发和evaneScent兴奋，以产生DFS模态和WGM。我们发现，使用WGM，我们可以观察到明确的强耦合签名，而使用DFS模式，我们没有。我们将我们的实验数据与简单的耦合振荡器模型进行了比较，并进行了基于有限元方法的数值模拟，以更清楚地了解我们的实验发现。
The way molecules absorb, transfer, and emit light can be dramatically modified by coupling them to optical cavities. The extent of the modification is often defined by the cavity-molecule coupling strength. Evaluating this coupling strength for different types of modes supported by a cavity is crucial in designing cavities for molecule-cavity coupling. Here we probe a unique multimode cavity, a dielectric microsphere, also called a soft-cavity, which supports two distinct types of mode, dark-field scattering (DFS) modes and whispering gallery modes (WGM). Though seemingly similar, these modes show different characteristics such as spatial electric field profile, resonance line-width etc. We investigated coupling of a mono-layer of J-aggregated dye molecules and a dielectric plastic microsphere using two techniques, far-field excitation and evanescent excitation to generate DFS modes and WGMs respectively. We found that using WGMs we observe a clear signature of strong coupling, whereas with DFS modes we do not. We compared our experimental data to a simple coupled oscillator model and performed finite-element method based numerical simulations to provide a clearer understanding of our experimental findings.
