Dr. Lucas Garnier Profile

Dr. Lucas Garnier

at Univ de Rennes 1

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Author

Publications (7)

Proceedings Article | 11 August 2023 Presentation + Paper

An innovative optical viscometer using a resonant surface signal

J. Gastebois, H. Lhermite, H. Cormerais, A. St. Jalmes, V. Vié, L. Garnier, B. Bêche

Proceedings Volume 12622, 126220N (2023) https://doi.org/10.1117/12.2672418

KEYWORDS: Nanoparticles, Mixtures, Viscosity, Signal processing, Waveguides, Optical surfaces, Polymers, Microresonators

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Proceedings Article | 24 May 2022 Poster + Paper

Integrated symmetrical organic/semiconductor structures produced by hybrid processes: photonic micro-resonators cavities

R. Sevestre, N. Coulon, L. Garnier, H. Lhermite, A. Moréac, H. Cormerais, L. Le Brizoual, F. Le Bihan, D. Balcon, B. Bêche

Proceedings Volume 12149, 1214907 (2022) https://doi.org/10.1117/12.2617999

KEYWORDS: Silicon, Resonators, Plasma enhanced chemical vapor deposition, Heterojunctions, Raman spectroscopy, Semiconducting wafers, Microresonators, Deep ultraviolet, Silica, Polymers

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Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Determination of a statistical lack of volume matter by resonance principle: experiential approach and modeling

A. Doliveira, L. Garnier, F. Mahé, H. Lhermite, E. Gaviot, B. Bêche

Proceedings Volume 11775, 1177513 (2021) https://doi.org/10.1117/12.2588840

KEYWORDS: Waveguides, Statistical modeling, Resonators, Radio propagation, Microresonators, Electromagnetism, Deep ultraviolet, Wave propagation, Ultraviolet radiation, Ranging

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Proceedings Article | 18 April 2021 Presentation + Paper

Determination of Stokes velocities and sedimentation rate by a photonic resonant surface signal

L. Garnier, H. Lhermite, V. Vié, H. Cormerais, B. Bêche

Proceedings Volume 11772, 117720L (2021) https://doi.org/10.1117/12.2588839

KEYWORDS: Particles, Spherical lenses, Optical lithography, Inflammation, Data modeling, Blood, Spectrum analysis, Solids, Sensors, Resonators

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The sedimentation of solid particles in a liquid is a physical phenomenon that necessitate to be well understood and measured in several cases. In medical diagnosis, a knowledge of the sedimentation speed of red blood cells for example, allows the early diagnosis of various inflammations. In study, optical Micro-Resonators (MRs) are used as sensors to track the dynamical phenomenon of sedimentation of a cloud of nano-particles in water, and the associated consequences on the spectral characteristics of the guided mode are analyzed. A MR is characterized by its eigenvalue, namely the effective index of an optical mode propagating inside. A progressive modification of the environment thus induces a temporal variation of the effective index. Such a variation can be measured by the tracking of the Free Spectral Range (FSR) of the transduced spectra against time. The transduced optical signal is then directed towards an Optical Spectrum Analyzer (OSA) from which spectra are acquired against time. A millimeter tank filled with water is judiciously deposited on the surface of the chip, before the adding of the solution of nano-particles. The spectra are acquired during the whole duration of the process of sedimentation. The data collected this way are then compared to a simple theoretical model describing the sedimentation of a spherical particle in water. Moreover, the sedimentation theory and the derivation of the speed of sedimentation of a spherical particle is presented, plus the presentation of the experimental setup, from the fabrication of the photonic structure by photolithography, to the inclusion of this circuit in an optical characterization platform and the presentation of the data acquisition and treatment program. The experimental results are analyzed and discussed. The differences are around 10% over the theoretical Stokes velocities relating to such sedimentation process. An overall generic curve or spectral response is clearly demonstrated on these sedimentation processes.

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Analysis of giant waveguide tapers with funnel geometry: multi-mode Interference regime to single mode

F. Mahé, L. Garnier, B. Bêche

Proceedings Volume 11775, 1177514 (2021) https://doi.org/10.1117/12.2588841

KEYWORDS: Waveguides, Cladding, Brain-machine interfaces, Refractive index, Numerical simulations, Maxwell's equations, Light wave propagation, Integrated optical circuits, Finite element methods

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Proceedings Article | 2 April 2020 Paper

About monitoring the dynamics of phase transition in food and biology by micro-photonics: detecting soft-matter process

L. Garnier, R. Castro-Beltran, A. Saint-Jalmes, H. Lhermite, A.-L. Fameau, V. Vié, E. Gicquel, H. Cormerais, B. Bêche

Proceedings Volume 11364, 113641T (2020) https://doi.org/10.1117/12.2564645

KEYWORDS: Polymers, Photonics, Microresonators, Biology, Sensors, Waveguides, Resonators, Integrated optics, Phase measurement, Deep ultraviolet

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We have investigated the ability to monitor the dynamics transition phase of various substances by resonant probe light. Such a specific Micro-Total Analysis Systems (μTAS) can be used in food, cosmetic and biology applications. Such labon- chip sensors present the possibility of data treatment with an embedded system. The serial of transduced spectra are then acquired with an optical spectrum analyzer linked to a computer on which Matlab software record and process the data in real time. Then specific quantities can be linked to the intrinsic physico-chemical characteristics of the substances. As an example (not exhaustive) the development and the ability of an optical integrated polymeric resonator, acting as a surface light probe, for monitoring temperature-induced supramolecular phase transitions will be presented. The homogeneous detection of the transitions between different self-assembled structures in an aqueous solution of fatty acids (12-hydroxystearic acid, in association with amino-pentanol) was studied by investigating the coupling between the solution and the integrated photonic micro-cavity. Tuning the self-organized assemblies of surfactant is very attractive for many applications, such as cosmetic products, food, drug delivery and medical, and the development of alternative tools - especially those requiring minute amount of solution - to monitor their structural changes are essential. These original studies at temperatures ranging from 17 to 24 °C, based on a statistical treatment of optical resonance spectra, have evidenced the thermoresponsive nature of the optical features, and that different regimes occur with temperature. The optical results were corroborated with the measurement of the solution viscosity as a function of temperature, confirming that we can ascribe the optically-detected regimes to a surfactant assembly shifting reversibly from a tubular shape to a micellar one. The comparison between the optical and the rheological responses showed different accuracies: while the viscosity data exhibited a rather smooth and monotonous transition, the behavior changes were sharper and non-monotonous in terms of optical properties, allowing us to unambiguously identify in intermediate regime between 18.5 and 20°C. These morphological transition experiments represent a unique opportunity to extend the numbers of available techniques studying these systems through integrated optical techniques with potential opportunities of real time detection and working on low sampling volume. Other examples will be developed as the detecting of phase transition of sphingomyelin in biology and health corroborate by differential scanning calorimetry.

Proceedings Article | 24 May 2018 Presentation + Paper

About detecting steam condensation by means of polymer racetrack micro-resonators: highlighting the dynamics of such a soft matter process

L. Garnier, H. Lhermite, V. Vié, Q. Li, M. Berges, V. Cazin, H. Cormerais, J. Weiss, E. Gaviot, B. Bêche

Proceedings Volume 10678, 106780C (2018) https://doi.org/10.1117/12.2311486

KEYWORDS: Microresonators, Sensors, Polymers, Resonators, Waveguides, Cladding, Deep ultraviolet, Signal processing, Integrated photonics

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We have investigated the effect of brutal steam condensation processes and the behavior of its condensed water prior evaporation, with an integrated resonant photonic structure and dynamic tracking of its transduced signal. The aim of this analysis is to develop a steam condensation lab-on-chip sensor, with the possibility of data treatment with an embedded system. Integrated photonic micro-resonators (MRs) devices have been designed and fabricated with polymer UV210 by means of Deep-UV photolithography. Thanks to this technique, we have achieved racetrack shaped micro-resonators coupled to suited access waveguides. We have assessed such MRs with different geometrical characteristics while changing respectively; the coupling length (LC), the radius of curvature (R) and the width (w) of the guides. The chosen values for the set of parameters LC-R-w (in μm) are 5-5-3 and 10-10-3. The laser source used with the injection bench is a Gaussian broadband laser (λ_central=790 nm, FWHM=40 nm) allowing us to visualize several resonances at the same time in order to multiplex the relevant measurements. The transduced spectrum is then acquired with an Optical Spectrum Analyzer (OSA) linked to a computer with Labview and Matlab software recording and processing data in real time. Then, relevant characteristics to be tracked are the Free Spectral Range (FSR) and the transmitted energy; these quantities can be linked to the physical characteristics of the structure considering both the effective refractive index and the absorption coefficient. The experimental set-up also includes various movies with a top-view imaging camera of the chip (MRs) recording the soft matter process steps, so as to correlate the changes in the transduced spectrum and the behavior of the condensed steam mechanisms (condensation, coalescence and evaporation). Then, the chip is fitted with a temperature controller, so as to carry out measurements at different temperatures: 20°C, 24°C and 28°C.

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