A perforated microring resonator for optical sensing applications

In this paper, we present numerical simulations of a refractive index sensor based on a perforated optical microring resonator. We show that the introduction of subwavelength perforations in the microring resonator increases the light–matter interaction and the sensitivity of the microring resonator. Here, the sensor performance is analyzed in two sensing schemes: bulk sensing and dielectric particle sensing. In both applications the perforated microring resonator sensor outperforms an ordinary microring resonator sensor and also maintains a high quality factor. The simulations were performed using finite-difference time domain and finite-element methods.