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]
< Reduce
Laboratoire de l'intégration, du matériau au système [IMS]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Language
EN
Article de revue
This item was published in
Journal of Lightwave Technology. 2023-03-01, vol. 41, n° 5, p. 1571-1581
English Abstract
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 ...Read more >
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.Read less <
Keywords
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
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