论文标题
来自许多分子的表面增强拉曼散射中的光力集体效应
Optomechanical Collective Effects in Surface-Enhanced Raman Scattering from Many Molecules
论文作者
论文摘要
分子之间的相互作用通常在表面增强的拉曼散射（SERS）中被忽略。在此假设下，总SERS信号被描述为独立处理的每个分子的单个贡献之和。我们在这里采用了对空腔量子电动力学框架中SER的光学机械描述，以研究如何从不同分子的量子相关性中出现集体效应。 We derive analytical expressions for identical molecules and implement numerical simulations to analyze two types of collective phenomena: (i) a decrease of the laser intensity threshold to observe strong non-linearities as the number of molecules increases, within intense illumination, and (ii) identification of superradiance in the SERS signal, namely a quadratic scaling with the number of molecules.观察后者散射中后者所需的激光强度相对适度，这使得它在实验中特别容易获得。我们的结果还表明，在存在中等均匀和不均匀的拓宽的情况下，集体现象可以生存。
The interaction between molecules is commonly ignored in surface-enhanced Raman scattering (SERS). Under this assumption, the total SERS signal is described as the sum of the individual contributions of each molecule treated independently. We adopt here an optomechanical description of SERS within a cavity quantum electrodynamics framework to study how collective effects emerge from the quantum correlations of distinct molecules. We derive analytical expressions for identical molecules and implement numerical simulations to analyze two types of collective phenomena: (i) a decrease of the laser intensity threshold to observe strong non-linearities as the number of molecules increases, within intense illumination, and (ii) identification of superradiance in the SERS signal, namely a quadratic scaling with the number of molecules. The laser intensity required to observe the latter in the anti-Stokes scattering is relatively moderate, which makes it particularly accessible to experiments. Our results also show that collective phenomena can survive in the presence of moderate homogeneous and inhomogeneous broadening.
