transmittance of mim waveguides containing semi-circular ring shaped and rectangular ring shaped grooves

In this paper the transmittance of metal-insulator-metal (mim) waveguides containing semi-circular ring shaped and rectangular ring shaped grooves are investigated theoretically in the 500 nm to 1700 nm wavelength range. by varying groove parameters their effects on the transmittance of the mim waveguides are investigated. the results show that the transmittance spectra of the waveguides have maximum and minimum points, and by using appropriate parameters for the grooves it is possible to make the transmittance maximum or minimum at a required frequency. therefore by using the ring shaped grooves in the mim waveguides a frequency splitter is designed. the results show that the efficiency of an mim waveguide containing the ring shaped groove for filtering a required frequency is higher than the efficiency of an mim waveguide containing tooth shaped groove.