Study on spectral properties of local graphene-assisted micro-nanostructures

Abstract

The design and fabrication of the micro-nanostructures on materials surface is a challenging technology which can modulate and control the selective broadband spectra radiation, and the light-matter interaction mechanism behind have become the main research direction of filters, absorbers, heat radiators and other devices. Due to its high carrier mobility and excellent optical properties, graphene combined with microstructure, is likely to make great contributions to the field of spectral manipulation. In this paper, the finite-difference time-domain (FDTD) method is used to simulate the combination of graphene and microstructure. Using graphene to assist silicon, copper and nickel materials with different structures by exploring their spectral selectivity manipulation. Regarding the presence or absence of graphene, we designed grating structure model and pore array structure model for these three materials respectively, and studied the change of reflection spectrum by changing the micro-nanostructures parameters of the model. It was found that when the graphene and the substrate lattice were properly matched, the absorption effect of grating structures coated with graphene was stronger than that of grating structures without graphene when the incident light wavelength in the range of 300 nm–800 nm. At the same time, it is confirmed that the absorption effect of the grating structure is better than that of the hole array structure under the same incident light wavelength.