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Setting Up and Assessing a New Micro-Structured Waveguiding Fluorescent Architecture on Glass Entirely Elaborated by
Morgane Bonnel1, Ibtihel Marzouk1,2, David Riassetto1
1LMGP, Grenoble INP, CNRS, University Grenoble Alpes, 38000 Grenoble, France.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
We developed a novel sol-gel glass architecture with integrated diffraction gratings for efficient light coupling in fluorescent channel waveguides. This technology enables robust optical sensing with high positioning tolerance, paving the way for microfluidic fluorescence measurements.
Area of Science:
- Photonics and optical engineering
- Materials science
- Sol-gel chemistry
Background:
- Channel waveguides with diffraction gratings are crucial for optical and photonic devices.
- Sol-gel processing offers a versatile route for fabricating micro-structured optical components.
Purpose of the Study:
- To report the first sol-gel elaborated glass architecture with integrated diffraction gratings for fluorescent channel waveguides.
- To investigate the performance of waveguides doped with a ruthenium-complex fluorophore (Rudpp).
Main Methods:
- Fabrication of titanium-oxide-based photoresist microstructures on glass via single-step photolithography and sol-gel processing.
- Characterization of light coupling and fluorescence signal propagation within the channel waveguides.
- Assessment of fiber positioning tolerances for excitation and emission signals.
Main Results:
- Demonstrated efficient coupling and propagation of fluorescence signals within the sol-gel micro-structured waveguides.
- Achieved significant fiber positioning tolerances (degrees angular, >100 µm spatial) at the Rudpp emission wavelength.
- Identified optimal Rudpp concentration (~0.1 mM) and waveguide length (2-5 mm) for signal detection.
Conclusions:
- The developed sol-gel architecture is well-suited for efficient optical coupling and fluorescence signal guiding.
- This work is a significant step towards integrating the architecture into microfluidic platforms for advanced fluorescence measurements.
