Compact SOI optimized slot microring coupled phase-shifted Bragg grating resonator for sensing

Abstract We propose a novel sensor structure composed of a slot microring and a phase-shifted sidewall Bragg gratings in a slot waveguide. We first present a theoretical analysis of transmission by using the transfer matrix. Then, the mode-field distributions of transmission spectrum obtained from 3D simulations based on FDTD method demonstrates that our sensor exhibit theoretical sensitivity of 297 . 13 nm ∕ RIU , a minimum detection limit of 1 . 1 × 1 0 − 4 RIU , the maximum extinction ratio of 20 dB, the quality factor of 2 × 1 0 3 and a compact dimension-theoretical structure of 15 μ m × 8 . 5 μ m . Finally, the sensor’s performance is simulated for NaCl solution.