F-shaped Channel-Drop Filter Based On Photonic Crystal Double Ring Resonators

In this paper, we demonstrate a new type of 2D photonic crystal F-shaped channel-drop filter based on double ring resonators with narrow bandwidth and high transmission. The parameters which affect resonant frequency and output bandwidth are investigated. These parameters include refractive index of inner rods and coupling rods as well as radius of the coupling rods. In the two output ports of the second resonator, the output central frequency of frequency band can be transformed flexibly and the transmission of the two output ports can be changed easily by varying the radii of coupling rods and refractive index of inner rods. The F-shaped channel-drop filter can achieve transmittance of 87% and quality factor of 778 at the D output port and get transmittance of 82% and quality factor of 255 at the C output port simultaneously, found by finite difference time domain(FDTD) method.