The silicon-based racetrack microcavity resonator: modeling and numerical experiments

This paper proposes the simulations of a racetrack microcavity resonator on a silicon substrate. The FDTD simulation was used as a numerical tool to find the optimized dimensions of the structure for 1.55 μm wavelength. A simple modeling based on mode coupling theory was also proposed to find the spectral characteristics of the device. The device obtains the characteristics: FSR of 21.5 and of 155 from mode coupling theory, compared with the characteristics: FSR of 22 and of 135 from FDTD method. This means the proposed analytic model of mode coupling theory could be employed as a method to promptly characterize the device, as well as other structures.