1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
We conduct in-situ near-field imaging of propagating and localized plasmons (cavity and dipole modes) in graphene nano-resonator. Compared with propagating graphene plasmons, the localized modes show twofold near-field amplitude and high volume confining ability (~106). The cavity resonance and dipole mode of graphene plasmons can be effectively controlled through optical method. Furthermore, our numerical simulation shows quantitative agreement with experimental measurements. The results provide insights into the nature of localized graphene plasmons and demonstrate a new way to study the localization of polaritons in Van der Waals materials.
(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
Fund:
Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0203500), the National Natural Science Foundation of China (Grant No. 11474350), the State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, China and the State Key Laboratory for Artificial Microstructure & Mesoscopic Physics, Peking University, China.
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