Narrowband Photonic Crystal THz Compact Filter Based on Microring Resonators

Photonic crystal microring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a hexagon-shaped structure at the... [ view full abstract ]

Photonic crystal microring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a hexagon-shaped structure at the middle of on 7*7 square cavity, we created a microring resonator structure and designed a narrowband channel drop compact filter. The drop wavelength of the proposed filter is at 1550.4 nm, with transmission efficiency and quality factor equal to 94% and 707. Our structure is composed of dielectric rods immersed in air. Because in this kind of structures the dominant band gap is in TM mode, all of our simulations have been done in TM mode. The total footprint of the proposed THz filter is 199.4 m2, which makes it suitable for all optical integrated circuits. The parameters of the proposed structure proving that this block is suitable for optical communication systems and the frequency ranges are in the communication application window.