What is it about?
A symmetric Mach-Zehnder interferometric sensor employing ring-resonator circuits for slow-light enhancement of the sensor performance was theoretically investigated. The slow-light structures considered are coupled-resonator optical waveguide (CROW), four-port single ring-resonator (FPRR), and two-port single ring-resonator (TPRR) circuits. The results show that a realistic TPRR can reach resolution of 3.63E-10 RIU which is 5 times better than FPRR and 3-resonator CROW while giving figure of merit of 5 and 15 times better compared to FPRR and 3-resonator CROW, respectively.
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Why is it important?
The paper reveals that using single ring-resonator is more beneficial than coupled multiple resonators. Using two-port single ring-resonator (TPRR) as slow-light circuit, the limit of detection can reach 3.63 E -10 RIU for ring with attenuation constant of 1 dB/cm, ring radius of 300 μm, and 20 dB insertion loss budget.
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This page is a summary of: Modeling of Mach-Zehnder Interferometric Sensors Employing Ring-Resonator Circuits for Slow-Light Enhancement, IEEE Photonics Journal, December 2023, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/jphot.2023.3330985.
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