Optics and Photonics Society of Iran

In this paper the transmittance of a metal-dielectric-metal  waveguide containing rectangular ring shaped grooves is investigated. The presence of one rectangular ring shaped groove in the waveguide causes the transmittance spectrum of the waveguide to have points with maximum and minimum transmittance values on the spectrum. The wavelength difference between the maximum and minimum points is not tunable, and the transition from maximum value of transmittance to minimum value is not fast. However, by using a few rectangular ring shaped grooves inside the metal-dielectric-metal waveguide it is possible to make the transmittance zero in a range of wavelengths, while having acceptable values for transmittance in another wavelength ranges, and in addition the transition from maximum value of transmittance to minimum value is fast. Therefore these structures can be used for filtering electromagnetic waves, where in this paper by using a few rectangular ring shaped grooves a frequency splitter is designed for second and third telecommunication windows.