Ultra-high-Q optical filter based on photonic crystal ring resonator

• DOI: 10.1007/s11107-017-0732-x
• Publication Date: 2017-09-07T19:26:49Z
• Authors: Mahmood Seifouri; Vahid Fallahi; Saeed Olyaee
• Keywords: Plane wave expansion; Transmission coefficient; Hexagonal Lattice; Q factor

In this study, a photonic crystal ring resonator with a triangular lattice is used to design an optical filter. The proposed structure is able to filter the central wavelength of 1548 nm with a transmission coefficient of over 95%. Moreover, this structure has an ultra-high-quality factor (Q) of about 1290. With altering the features of the structure including the refractive index, the lattice constant and the radius of the rods in the resonator core, their effects on the central wavelength of the filter, transmission coefficient, quality factor and bandwidth are investigated. The plane wave expansion and finite-difference time-domain methods are used to extract photonic band gap and investigate the photonic behavior of the proposed structure, respectively.