Laser beam scattering can be used to modify the surface properties of materials. Periodic nanopatterns can be either directly or indirectly fabricated. However, collective oscillations of electrons at the interface of a metal and a dielectric material can be fabricated on a substrate using surface plasmons. A computer simulation results of laser beam transmission and scattering for aluminum, copper, Al2O3 and glass is carried out. The results showed that in the metallic materials coated slits, the laser beam intensity is amplified in the slit compared to the in port by 47.7% for aluminium and 49.2% for copper. However, significant loss was found at both alumina and glass slit material. The intensity of the E-field at the out port is weakened to about 50% for the metallic materials, compared to 66% and 87% for Al2O3 and glass. It was concluded that the laser beams are strongly diffracted right after metallic slits which can primarily cause scattering.