Experimental demonstration of highly sensitive visible detection with polymer microresonator transducers based-on porous silica cladding

Pauline Girault; Théo Rouanet; Laurent Oyhenart; Guillaume Beaudin; Simon Joly; Bernard Plano; Michael Canva; Paul G. Charette; Laurent Béchou

doi:10.1117/12.3015267

6 June 2024 Experimental demonstration of highly sensitive visible detection with polymer microresonator transducers based-on porous silica cladding

Pauline Girault, Théo Rouanet, Laurent Oyhenart, Guillaume Beaudin, Simon Joly, Bernard Plano, Michael Canva, Paul G. Charette, Laurent Béchou

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Proceedings Volume 12999, Optical Sensing and Detection VIII; 1299924 (2024) https://doi.org/10.1117/12.3015267
Event: SPIE Photonics Europe, 2024, Strasbourg, France

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Abstract

This work aims to develop polymer-based optical micro-resonator sensors, operating in the visible range and sensitive for homogeneous in-situ detection of pollutants in aqueous medium. This paper demonstrates that using a porous silica cladding (ns = 1.2) enhances significantly the interaction of the evanescent field with the analytes by modifying the propagation properties of the guided optical mode. The results improve sensitivity without complicating the design and avoiding surface chemical functionalization classically used for such application. Detection experiments based on real part refractive index change in the visible range have been conducted using different glucose concentrations. A sensitivity at the state-of-the-art of 255 ± 12 nm/RIU has been achieved at 760 nm for micro-resonator polymer waveguides on porous silica. These promising results enable the use of our devices in sensors to detect both real and imaginary parts of the analyzed medium refractive index, as well as analysis of complex environments.

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Pauline Girault, Théo Rouanet, Laurent Oyhenart, Guillaume Beaudin, Simon Joly, Bernard Plano, Michael Canva, Paul G. Charette, and Laurent Béchou "Experimental demonstration of highly sensitive visible detection with polymer microresonator transducers based-on porous silica cladding", Proc. SPIE 12999, Optical Sensing and Detection VIII, 1299924 (6 June 2024); https://doi.org/10.1117/12.3015267

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