论文标题
荧光检测的手性分子单层的圆二色性与介电元面孔
Fluorescence-Detected Circular Dichroism of a Chiral Molecular Monolayer with Dielectric Metasurfaces
论文作者
论文摘要
分子圆二色性的强大增强具有有效的不对称光解，这是一种手性分离方法，通常受到屈服不足和低对映体过量的影响。在这里，我们在实验上研究了如何预测谐振硅纳米风险的光学手性密度的增强，增强了圆形二分法。我们使用荧光检测的圆形二色性光谱法间接测量了通过官能化在硅纳米阵列阵列的光学活性分子的单层对圆极化光的差异吸收。重要的是，分子和纳米界天线具有光谱均匀的共振，我们的荧光技术使我们能够从分子的纳米虫中解散吸收。我们发现，增强的荧光检测的圆二色性信号取决于与模拟的差异吸收和光学手性密度良好一致的纳米光共振，而在无特征性硅表面上吸附的分子中未检测到信号。这些结果验证了用于较低能量需求的非对称光解的纳米光量平台的潜力
Strong enhancement of molecular circular dichroism has the potential to enable efficient asymmetric photolysis, a method of chiral separation that has conventionally been impeded by insufficient yield and low enantiomeric excess. Here, we study experimentally how predicted enhancements in optical chirality density near resonant silicon nanodisks boost circular dichroism. We use fluorescence-detected circular dichroism spectroscopy to measure indirectly the differential absorption of circularly polarized light by a monolayer of optically active molecules functionalized to silicon nanodisk arrays. Importantly, the molecules and nanodisk antennas have spectrally-coincident resonances, and our fluorescence technique allows us to deconvolute absorption in the nanodisks from the molecules. We find that enhanced fluorescence-detected circular dichroism signals depend on nanophotonic resonances in good agreement with simulated differential absorption and optical chirality density, while no signal is detected from molecules adsorbed on featureless silicon surfaces. These results verify the potential of nanophotonic platforms to be used for asymmetric photolysis with lower energy requirements
