Fluorescence spectroscopy is commonly employed to study the excited-state photophysics of organic molecules. Planar Fabry-Prot microcavities play an essential role in such studies and a strategic cavity design is necessary to attain an enhanced light-matter interaction. In this work, we computationally study different geometries for a planar metallic Fabry-Prot microcavity tuned for the absorption of Sulforhodamine 101, a typical dye for fluorescence spectroscopy. The cavity consists of a polymer layer enclosed between two silver mirrors, where the thicknesses of all the three layers are varied to optimize the cavity. Our transfer-matrix and finite-difference time-domain simulations suggest that a cavity with 30 nm thin top mirror and 200 nm fully reflective thick bottom mirror, thus having only reflection and absorption and no transmission, is an optimal design for maximizing the Purcell factor and spectral overlap between the cavity and molecule, while still sustaining an efficient measurability of the fluorescence.

荧光光谱通常用于研究有机分子的激发态光物理。平面 Fabry-Prot 微腔在此类研究中起着至关重要的作用，并且需要战略性的腔设计来实现增强的光-物质相互作用。在这项工作中，我们通过计算研究了平面金属 Fabry-Prot 微腔的不同几何形状，该微腔针对 Sulforhodamine 101（一种典型的荧光光谱染料）的吸收进行了调整。腔体由封闭在两个银镜之间的聚合物层组成，其中所有三层的厚度都不同以优化腔体。我们的传递矩阵和有限差分时域模拟表明，具有 30 nm 薄顶镜和 200 nm 全反射厚底镜的腔，因此只有反射和吸收，没有透射，