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表面等离激元与量子发射体间的强耦合现象近几年来受到广泛关注，这种现象通常通过散射、 吸收、 荧光等远场光谱探测方法进行研究。 利用高度聚焦的电子束， 电子能量损失谱能够实现亚纳米尺度的局域探测，可以更加有效的研究强耦合现象。 本文在理论上分别模拟了银纳米棒、介质材料以及介质层包裹银纳米棒复合结构的电子能量损失谱。 得到了与实验结果可以比拟的银纳米棒表面等离激元的电子能量损失谱。 在上述复合结构的电子能量损失谱中观察到了谱峰的拉比劈裂， 探究了银纳米棒尺寸对拉比劈裂的影响。 分别在红外、 可见波段讨论了介质层的元激发与银纳米棒偶极辐射及高阶非辐射表面等离激元模式间的强耦合现象， 从损失谱的空间分布成像角度探讨了强耦合引起的杂化等离激子（ Plexciton） 的形成。 本研究对强耦合现象的进一步实验和理论研究具有指导意义。The strong coupling phenomenon between surface plasmons and quantum emitters has received extensive attention in recent years. It is usually studied by far-field spectral detection methods such as scattering, absorption, and fluorescence. Electron energy loss spectroscopy（EELS） utilizes highly focused electron beams for local detection at sub-nanometer scale, which can be more effective for strong coupling studies. In this paper, the EELS of silver nanorods, dielectric materials and their composite core-shell nanostructures were theoretically simulated respectively, and the energy and mode characteristics of surface plasmons on the silver nanorods and the excitation characteristics of dielectric materials were obtained. The EELS of surface plasmon is basically consistent with the related experiments. Rabi splitting of spectral peaks was observed in the EELS of the above composite structures, and the effect of Ag nanorod size on Rabi splitting was explored. The strong coupling between the radiative dipolar and non-radiative higher-order plasmon with the excitation of the dielectric materials in the infrared and visible band is discussed, and the corresponding dispersion relation is analyzed with the coupled oscillator mode. Furthermore, the plexciton caused by strong coupling are discussed from the perspective of spatial distribution of loss spectrum imaging. Our study builds the basis for further theoretical study, and can guide the further experimental research.
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Keywords:
- EELS /
- surface plasmon /
- strong coupling
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