Dual-working mode device based on dual-element photonic crystal-stepped concave waveguide

Abstract

Abstract In this study, a Si3N4 on insulator device used for photonic integrated circuits (PICs) is proposed. The dual-working mode device is constructed using a racetrack microring resonator, which is established using a dual-element photonic crystal-stepped concave waveguide. A novel scheme of dual-working modes is realized, and sensing and filtering are performed simultaneously without interference. The results show that a sensitivity of 29 pm K−1 and a line width of 0.28 nm are obtained for the sensor mode. An extinction of 41.8 dB and bandwidth of up to 305.5 nm are achieved in the filter mode. The footprint of the entire device is within 20 μm × 11 μm, which is ultra-compact and suitable for PICs.