Channel-drop filter based on a photonic crystal ring resonator

In this paper combining a square lattice photonic crystal with a 12-fold quasicrystal, we proposed a new design for an optical channel-drop filter. Our proposed structure has a transmission efficiency very close to 1 and the band width and quality factor values for this structure are 4.5 nm and 344. After designing the channel-drop filter we investigated the effect of different parameters on the output wavelength of the filter. It has been shown that by changing the dielectric rods’ refractive index, radius of initial structure rods and the radius of the 12-fold quasicrystal rods we can obtain different output wavelengths of the filter.