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| Surface plasmon performance of grating structure with graphene |
| 1. School of Communication and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210003, China; 2. Wireless Product Operation Department, ZTE Corporation, Nanjing, Jiangsu 210012, China |
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Abstract To overcome the conventional optical diffraction limit and realize small transmission loss and strong localization of optical field, based on graphene surface plasmas (GSPs), a graphene periodic grating optical waveguide structure was designed and investigated. The structure was composed of air layer, buffer layer, waveguide layer and substrate layer with the leaky mode resonance effect to generate GSPs. The performance of GSPs was analyzed by quality factor and effective mode area respectively, which was optimized by adjusting the graphene characteristic parameters of Fermi level and carrier mobility. The simulation results show that when the Fermi level is 0.63 eV, GSPs have the best performance and the strongest spatial localization. With the increasing of carrier mobility, the propagation loss can be decreased with increased transmission distance of GSPs, but it has limited effect on the spatial localization characteristics.
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Received: 18 November 2021
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2022, Vol. 43 
