利用振动强耦合增强分子拉曼光谱
Enriching molecular Raman spectroscopy with vibrational strong coupling
- Technical University of Denmark（丹麦技术大学）
- Copenhagen University Hospital (Rigshospitalet)（哥本哈根大学医院（rigshospitalet））
- University of Copenhagen（哥本哈根大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文理论上证明振动强耦合可重塑拉曼光谱，通过近共振和非共振耦合调控振动能量与强度，并指出观测极化激元拉曼信号需特定几何结构。
AI中文摘要：
拉曼光谱广泛用于生物样品中的分子鉴定，但光谱拥挤常常掩盖关键的分子指纹。因此，需要能够丰富振动光谱并增加可控特征的策略。我们从理论上证明，振动强耦合（VSC）可以通过重组振动能量和强度来重塑拉曼光谱。近共振耦合能够分辨准简并振动模式，并在分子振动之间重新分配拉曼活性，使原本拉曼不活跃的模式变亮。非共振耦合介导振动之间的有效相互作用，通过腔控制的振动混合实现可调的强度重组和光谱位移。利用拉曼散射的微观理论，我们表明从集体VSC极化激元观察拉曼信号需要适当的散射装置、样品和腔环境的几何结构，这有助于解释为什么极化激元拉曼特征在实验上仍然难以观察。
英文摘要：
Raman spectroscopy is widely used for molecular identification in biological samples, but spectral congestion often obscures key molecular fingerprints. Strategies to enrich vibrational spectra with additional controllable features are therefore desirable. We theoretically show that vibrational strong coupling (VSC) can reshape Raman spectra by reorganizing vibrational energies and intensities. Near-resonant coupling enables the resolution of quasi-degenerate vibrational modes and redistributes Raman activity among molecular vibrations, brightening otherwise Raman-inactive modes. Off-resonant coupling mediates effective interactions between vibrations, leading to tunable intensity reorganizations and spectral shifts via cavity-controlled vibrational mixing. Using a microscopic theory of Raman scattering, we show that observing Raman signals from collective VSC polaritons requires appropriate geometries for the scattering setup, the sample, and the cavity environment, helping to explain why polaritonic Raman signatures have remained challenging to observe experimentally.
