New Design of T-Shaped Channel Drop Filter Based on Photonic Crystal Ring Resonator

In this paper, we propose a new design of T-shaped channel drop filter using photonic crystal ring resonator. The proposed structure is composed of two photonic crystal waveguides and a square photonic crystal ring resonator with circular inner rods configuration. Calculations of band structure and normalized transmission spectra are done by plane wave expansion (PWE) and finite difference time domain (FDTD) methods, respectively. According to the results, we note that 100% dropping efficiency with quality factor of 502 is achievable at wavelength λ=1.578487 μm. The effect of varying different parameters on the resonant wavelength and dropping efficiency of the filter is investigated. These parameters include refractive index, radius of inner and whole rods.

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