Influence of Losses, Device Size, and Mode Confinement on Integrated Micro-Ring Resonator Performance for Absorption Spectroscopy Using Evanescent Field Sensing
BECHOU, Laurent
Laboratoire de l'intégration, du matériau au système [IMS]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
< Réduire
Laboratoire de l'intégration, du matériau au système [IMS]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Langue
EN
Article de revue
Ce document a été publié dans
Journal of Lightwave Technology. 2023-03-01, vol. 41, n° 5, p. 1571-1581
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés
Sensors
Fluids
Optical waveguides
Sensitivity
Absorption
Spectroscopy
Propagation losses
Fibre optic sensors
Optical resonators
Optical sensors
Optical waveguides
Refractive index
Absorption spectroscopy
Biosensor
Integrated photonics
Optical resonators
Simulations
Waveguides
Unités de recherche
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