Tunable anisotropic plasmon response of monolayer GeSe nanoribbon arrays
Recently, emerging two-dimensional (2D) Germanium Selenide (GeSe) has drawn lots of attentions, due to its in-plane anisotropic properties and great potential for optoelectronic applications such as for solar cells. While, methods are still sought to enhance its interaction with light to enable practical applications. Herein, we investigate the plasmon response of monolayer GeSe nanoribbon arrays systematically, the results show that localized surface plasmon polaritons in the far-infrared range with anisotropic behaviors can be efficiently excited to enhance the light-matter interaction. We further show that plasmon response of monolayer GeSe nanoribbons could be tuned effectively through the nanoribbon width, the local refractive index, substrate thickness and carrier concentration, pointing out the ways for controlling the plasmon response. In the case of monolayer GeSe nanoribbons on substrate of finite thickness, a Fabry-Perot-like (FP-like) quantitative model has been proposed to explain the overall spectra response originated from overlapped FP and plasmon modes, and it matches with the simulation results well. All in all, we investigate the plasmon response of the novel 2D GeSe nanoribbons thoroughly for the first time, bringing potential applications for novel polarization-dependent optoelectronic devices.