Hossein Shirkani

Due to the application of optical absorbers in important fields of science and industry, such as electro-optics, photonics, energy production, etc., also to reduce the destructive effects of electromagnetic waves in communication and information transmission, the design of optical absorbers has been focused by researchers. Considering the many applications of laser and the Gaussian nature of its beam, it is important to design Gaussian beam absorbers with high efficiency. In the last decade, the use of two-dimensional materials such as graphene, due to their unique optical properties, has been very effective in the design and production of optical absorbers. In this article, we have designed an optical absorber system in the visible to near-infrared range using a limited structure consisting of single-layer graphene and gold nanoribbons under TM wave radiation in the form of a Gaussian beam. To increase the effectiveness of the optical absorber by changing the dimensions of gold nanoribbons, a structure with the highest absorption rate by a single layer of graphene was achieved, then by changing the incident angle parameter of the radiation wave, structures with different numbers of nanoribbons were investigated. Also, we replaced gold nanoribbons with other noble metals and we paid an angular review on them. Finally, the highest amount of Gaussian beam absorption by the graphene monolayer is 60% and is related to a structure consisting of three silver nanoribbons. Finite element method (FEM) and Comsol simulation software have been used to design this absorber.