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Article Abstract
Monitoring of CO is crucial because of its profound impact on both environmental and human health. A novel highly sensitive refractive index (RI) sensor, utilizing a double-slot microring resonating structure, has been designed and numerically assessed for the sensitive detection of gas media. The structure consisted of a circular microring resonator nested in a racetrack resonating configuration mimicking the structure of an eye-shaped microring resonator (ESMRR). This system was simulated and designed for a GaAs double-slot core waveguide deposited on a suitable AlGaAs substrate. Optical transfer function of ESMRR and related equations were derived using Mason rule, while the numerical analysis was performed using the variational finite difference time domain (var- FDTD) method. The free spectral range (FSR) was extended to 137.68 nm that led to a remarkable bulk sensitivity of 1217.39 nm/RIU and a resolution of 4.93 × 10 RIU. The proposed sensing structure was envisioned for CO sensing and demonstrated an impressive sensitivity of 24.4 pm/ppm for CO detection with an estimated detection limit of 0.82 ppm.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12397389 | PMC |
| http://dx.doi.org/10.1038/s41598-025-17208-6 | DOI Listing |
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