▎ 摘　　要

We theoretically investigate a graphene-based heterogeneous plasmonic nano-trench for trapping noble metal and non-metal nanospheres. We propose heterogeneous plasmonic modeling geometry consisting of silver, gold and graphene for functioning plasmonic trapping operating at the near-infrared spectrum. For our designed model, the vertical potential well is 32 times larger than the Brownian motion energy KBT, indicating that the nanosphere can be stably trapped using the graphene covered gold and silver nano-trench structure. By varying the incident laser wavelength and angle of illumination, the gold nanosphere can be trapped stably 40 nm above the bottom of the proposed nano-trench structure. The graphene layer enhances the localized electric field of the nano-trench in comparison to a pure silver and gold nano-trench structure without a graphene layer on top.