Last modified: 2018-07-19
Abstract
In this paper, we proposed the design of optical filter with ring resonator based on two-dimensional photonic crystals. The filter is designed in two-dimensional photonic crystals (2D PCs) with square lattice of silicon rods in air. The lattice constant, 𝑎, and the rod radius, 𝑟, are designed to achieve maximum operating range of frequencies. The Plane Wave Expansion (PWE) method is used to obtain the band structure of the proposed model .The numerical simulation results through finite difference time domain method show that the electrical field distribution, high transmission efficiency are achievable at the resonant wavelength, which is an important for optical communication systems. Also, the effect of different parameters such as refractive index, lattice constant, the radius of the rods and the resonant wavelength on the filtering behavior of the structure is investigated. The obtained high transmission efficiency and the electrical field distribution of the filter are presented in this work. The proposed filter is characterized by its design simplicity and high transmission efficiency.
Keywords: Photonic crystal, optical filter, photonic crystal ring resonator, FDTD, PWE, transmission efficiency.