Influence of Losses, Device Size, and Mode Confinement on Integrated Micro-Ring Resonator Performance for Absorption Spectroscopy Using Evanescent Field Sensing - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Lightwave Technology Année : 2023

Influence of Losses, Device Size, and Mode Confinement on Integrated Micro-Ring Resonator Performance for Absorption Spectroscopy Using Evanescent Field Sensing

Résumé

This work presents a detailed modeling-based analysis of integrated micro-ring resonators used for absorption spectroscopy. Generally, sensors based on micro-ring resonators detect changes in the real part of the sensing medium refractive index, at critical coupling. In absorption spectroscopy, however, micro-ring resonators are used to measure changes in the imaginary part of the index and are most sensitive away from critical coupling, with separate maxima in the under- and over-coupled regimes. In this work, we present a detailed analysis of the under-coupled regime, explaining the relationships between sensitivity, mode confinement, and losses. The analysis is based on reverse-symmetry waveguides to increase the proportion of mode power in the sensing medium and incorporates a realistic model of propagation losses based on experimental measurements of sidewall roughness. The analysis demonstrates that the resonant nature of the sensor is most effective at small radii compared to a non-resonant structure of equal size and shows a behavior of diminishing returns at larger device sizes regarding sensitivity and elevated proportions of mode power in the evanescent field.
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Dates et versions

hal-04170945 , version 1 (27-11-2023)

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P. Girault, L. Oyhenart, T. Rouanet, S. Joly, G. Beaudin, et al.. Influence of Losses, Device Size, and Mode Confinement on Integrated Micro-Ring Resonator Performance for Absorption Spectroscopy Using Evanescent Field Sensing. Journal of Lightwave Technology, 2023, 41 (5), pp.1571-1581. ⟨10.1109/JLT.2022.3220982⟩. ⟨hal-04170945⟩
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