Zhao Yan, Liu Yi-Hong, Cao Shuo-Hui, Ajmal Muhammad, Zhai Yan-Yun, Pan Xiao-Hui, Chen Min, Li Yao-Qun
Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.
Department of Electronic Science, Xiamen University, Xiamen 361005, P. R. China.
J Phys Chem Lett. 2020 Apr 2;11(7):2701-2707. doi: 10.1021/acs.jpclett.0c00403. Epub 2020 Mar 23.
Light-matter interactions have always been a fundamentally significant topic that has attracted much attention. It is important to reveal a fluorophore-plasmon interaction on the nanoscale. However, as a powerful investigative tool, fluorescence spectroscopy still suffers from a limited spectral resolution and the susceptibility to interfering substances. In this work, excitation-emission synchronization-mediated surface-plasmon-coupled emission (EES-SPCE) is proposed to break the bottleneck. By actively screening the energy transitions for observation, an improved spectral resolution has been achieved, which is advantageous to the investigation of the fluorophore-plasmon interactions under different coupling modes. The spectral information related to the plasmonic interactions through tuning vibrational energy levels is clearly distinguished at directional emission angles. EES-SPCE is demonstrated to selectively and efficiently extract the coupled emission from the vibrational resolution, which would open up the opportunity to improve the capability of spectral feature identification and signal collection for practical applications of plasmonic fluorescence spectroscopy.
光与物质的相互作用一直是一个具有根本重要性且备受关注的课题。揭示纳米尺度下荧光团与等离子体激元的相互作用至关重要。然而，作为一种强大的研究工具，荧光光谱仍存在光谱分辨率有限以及易受干扰物质影响的问题。在这项工作中，提出了激发 - 发射同步介导的表面等离子体耦合发射（EES - SPCE）来突破这一瓶颈。通过主动筛选用于观察的能量跃迁，实现了更高的光谱分辨率，这有利于研究不同耦合模式下的荧光团 - 等离子体激元相互作用。在定向发射角度下，与通过调节振动能级的等离子体相互作用相关的光谱信息能够被清晰区分。EES - SPCE被证明能够从振动分辨率中选择性且高效地提取耦合发射，这将为提高等离子体荧光光谱实际应用中的光谱特征识别和信号收集能力带来机遇。
