graphene nanostructures were synthesized by hummer method. 1, 3, 5 and 7 wt% of graphene nanostructures were suspended in certain amount of acetone on a mechanical stirrer and stirred then added to epoxy resin. after 4 hours, solution and graphene platelets (gps) were prepared. nanostructures were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem ), fourier transform i...

According to quantum electrodynamics (QED), a strong external field can make the vacuum state decay producing electron-positron pairs. Here we investigate emission of soft photons which accompanies nonperturbative process pair production. Our analysis is carried out within Furry picture first order in fine-structure constant. It shown that presence initial gives rise an additional (stimulated) ...

Electromagnetic metasurface technology is one of the most promising technologies for electromagnetic energy regulation. It formed by an artificial periodic structure discrete subwavelengths at interface, allowing wavefront control and polarization subwavelength scale, exhibiting a variety special response capabilities, including abnormal beam bending, transformation, wave absorption, etc. We pr...