关键词: 圆偏光, 石墨烯, 超表面, 手性近场

Abstract: Based on the finite element method, the interaction between cirular polarized lights and graphene metasurfaces is simulated, which shows the properities of the far-field and near-field responses of graphene metasurfaces. Results show that the plasmonic resonances are stimulated by circular polarized lights at the mid-infrared region. The absorption spectra are independent with the polarized direction of incident lights, which results in zero far-field chiral responses. However, the surface charge distributions, the local electric fields and the chiral near-fields are closely related to the polarized direction of incident lights. Through numerical simulation, the knowledges of cirular polarized lights and electromagnetism can be shown vividly, which should deepen students’ understanding and stimulate students’ creative consciousness.

Key words: circular polarized light, graphene, metasurface, chiral near-fields