利用合成复频率分析的虚拟增益揭示天线-分子耦合
Revealing antenna-molecule coupling using virtual gain from synthetic complex frequency analysis
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中文总结 AI 辅助
本研究将合成复频率波（CFWs）应用于光刻调控耦合区间的Fano共振等离子体超表面，利用其虚拟增益补偿损耗，可揭示被损耗掩盖的分子振动模式并定量提取等离子体-分子耦合强度，为光-物质耦合评估提供定量工具。
中文摘要 AI 辅助
合成复频率波（CFWs）通过虚拟增益补偿损耗，从而提升光谱和空间分辨率，该方法在纳米光子学中尤为有用，因为损耗与强场约束及系统尺寸存在内在关联。本研究将CFWs应用于由Fano共振等离子体天线构成的超表面，这类超表面的弱耦合与强耦合区间之间的耦合可通过光刻调控，损耗可降至Drude阻尼极限。我们定量评估虚拟增益的影响，发现其在降低损耗的同时，内部耦合速率保持不变；与强光-物质耦合相关的奇异点在虚拟增益下也保持不变，但Fano干涉的协同性得到增强。当超表面功能化修饰有分子单分子层时，CFWs能够揭示分子的振动模式，即便这些模式被损耗掩盖，还可直接提取等离子体-分子耦合强度。因此，我们将CFW分析用作揭示和评估光-物质耦合的定量工具。
英文摘要
Synthetic complex frequency waves (CFWs) enhance spectral and spatial resolution by compensating loss through virtual gain. This approach is particularly useful in nano-photonics where loss is intrinsically linked to strong field confinement and system size. Here, we apply CFWs to metasurfaces composed of Fano-resonant plasmonic antennas with lithographically tunable coupling between the weak and strong coupling regimes and where loss may be reduced to the Drude damping limit. We quantitatively assess the impact of the virtual gain to find that, while reducing loss, internal coupling rates remain invariant. While the exceptional point associated with strong light-matter coupling is invariant under virtual gain, the cooperativity of Fano interference is enhanced. When the metasurfaces are functionalised with a molecular monolayer, CFWs are thus able to reveal a molecule's vibrational modes, even when obscured by loss, and allow direct extraction of the plasmon-molecule coupling strength. We thus use CFW analysis as a quantitative tool for revealing and assessing light matter-coupling.
