Mohsen Mehrabi

Today, due to the applications of optical absorbers in many fields such as electrooptics, photonics, optical sensor design, etc., a high-absorption structure has received much attention from researchers phosphorene is a monolayer of Black phosphorus with strong interaction of matter with light in the middle and far infrared range, which has been used as an excellent candidate in the absorbent structure due to its unique optical properties. One of the phenomena that leads to high absorption is plasmonic. In the absorber design, a grating structure made of aluminum oxide is used to intensify the surface plasmons, which cause the interaction of light and phosphorene, which ultimately leads to high absorption. To prevent light from passing through the end of the structure and increase absorption, a reflective layer of gold is placed under the structure and the absorption spectrum and surface plasmons formed are investigated. In order to improve system performance and increase efficiency, the geometric parameters of the structure have been optimized. Due to the limitations of experimental work, accurate and regular fabrication of gratings in nanometer dimensions, the effects of irregularrities in the geometry of gratings have been investigated. In order to create irregularities in the structure, the second grating was added to the structure, and to further investigate the irregularities, the third grating was added to the structure, then the absorption spectra and surface plasmons formed were examined for each structure, respectively. To increase the absorption and investigate the effect of irregular parameters, the structures are optimized. The results show that in the designed structure, irregular gratings do not significantly change the amount of adsorption. The absorption rate for the phosphorene layer remains at about 99.9%. This complete absorber also shows a wide absorption peak width of 7.5 μm. Changing the radiation angle in the range of 0 to 50 degrees reduces