The Effect of Different Metal Layers on the Absorption of One-Dimensional Structures Including WS2 Monolayer and Spacer Layer

Due to their optical characteristics, nanomaterials like WS2 monolayer are of huge importance in in photonic sensors and photovoltaic elements. Here, we propose designing a multi-layer structure based on metal and spacer layer to enhance light absorption of WS2 monolayer. The transfer matrix method is employed to study the optical characteristics of the structure. The maximum increase of absorption is observed when the spacer is inserted between metal and WS2 monolayer. Optimizing the thicknesses of the spacer and metal layer, which is chosen among Au, Ag, Cu, and Al, increases the light absorption of WS2 monolayer at a specific wavelength. The increase in the absorption of all of the four metals at the wavelength of 619 nm is almost equal (About 62%) but the amount of absorption of Au and Cu is higher than that of other metals in the visible range and absorption above 80% is observed only in these two metals. The results of this study provide new prospects for preparing high-performance optoelectronic devices