Prof. Bruno Bêche Profile

Prof. Bruno Bêche

Professor at Univ de Rennes 1

SPIE Involvement:

Author

Area of Expertise:

Integrated photonics , Components , Polymers , Soft Matter

Websites:

Personal Website | Company Website

Profile Summary

Bruno Bêche is Professor of Physics at the University of Rennes 1 (IPR then IETR of CNRS). He is Honorary Member of the 'Institut Universitaire de France' - IUF Paris. His teaching activity took place in several universities (Besançon, Le Mans, Angers, Nantes and Rennes) as well as in engineering schools in France (ENSIM, Polytech Nantes, INSA and Centrale/SupElect), holding lectures in fundamental and applied physics (mechanics, optics and photonics, quantum physics, solids states physics, materials and physics of components) at all student levels of education. His research career started on the development of optical components based on lithium niobate as non-linear optical devices, and then he worked in the development of III-V semiconductors as components for the wavelength division, multiplexing and lasers (FEMTO-ST and LAAS CNRS, France and NTT Corporation, Japan).
At the University of Rennes 1 (IETR CNRS 6164 Institute of Telecommunications transverse IPR CNRS 6251 Institute of Physics) he started a new field of research, working since a few years in the development of various micro-resonators based on hybrid technologies which combine the use of polymers and plasma treatments, soft matter with fluidic and biology concepts. His research work covers both the theoretical description of the physical aspects of these photonic devices and also the technologies, the characterization and their applications as integrated sensors in metrology so as to measure various dynamic soft matter processes.Very recent applications concern process measurements in soft matter such as sedimentation rate, creaming, flocculation measurements, phase transitions measurements in biology and agri-food products ...

Publications (18)

Proceedings Article | 11 August 2023 Presentation + Paper

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

Read Abstract +

Proceedings Article | 11 August 2023 Poster + Paper

Poster + Paper

Shaping and characterization of an integrated optic on polymer by simple 3D printing

E. Gavini, S. Pernon, J. Gastebois, N. Coulon, C. Levallois, A. Moréac, A. Saint-Jalmes, G. Querrec, B. Bêche

Proceedings Volume 12622, 1262210 (2023) https://doi.org/10.1117/12.2672419

KEYWORDS: 3D printing, Integrated optics, Waveguides, Polymers, Nozzles, Semiconducting wafers, Polyurethane, Printing

Read Abstract +

Integrated optics has been intensively developed the last decades for the production of components for telecommunications or sensors in metrology. The basic element constitutes the waveguide which transmits the information by guiding the light. The manufacturing processes take place in clean rooms with controlled atmosphere (pressure, temperature, dust) and with generally various deposition and coating machines. The production of these photonics devices remains relatively expensive since it is carried out in a clean room by series of manipulations which requires the intervention of a specialized engineer into a specific environment. More recently, techniques for manufacturing different mechanical parts of mostly research scientific devices have been developed using commercial 3D printers without the need of clean room environment. With such commercial machines, plastic materials are heated and then shaped by controlling their flow through a nozzle. This work concerns the study of the feasibility of realizing and shaping a kind of integrated optics by a simple 3D printer in a normal environment. It aims to understand and develop the fabrication of an integrated planar optics with polymer waveguides using a 3D printer and G-code programming. The coating processes and the G-codes of the 3D printer have been developed in order to produce the thermoplastic polyurethane (TPU) guiding structures onto a silicon/silica wafer. Finally, the characterization of this TPU organic (measurements of surface or energy tension, Raman analysis, ellipsometry measurements) and the optical injection made possible to validate this concept in terms of production and approach. The results concerning the shaping of various rib waveguides and obtaining a propagation of the light in organic thermoplastic polyurethane planar guides with fiber tapers by this simple and low-cost printing processes are positive. This work further proves that the development of integrated optics on thermoplastic polyurethane by 3D printing is possible; this opens the way to the realization of other optical patterns based on the 3D printer principle.

Proceedings Article | 24 May 2022 Poster + Paper

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

Read Abstract +

Proceedings Article | 17 May 2022 Presentation + Paper

Presentation + Paper

On the dynamic monitoring of the variations in blood viscosity by resonant optical signal

Lucas Garnier, Hervé Lhermite, Timothée Labouret, Arnaud Saint-Jalmes, Hervé Cormerais, Véronique Vié, Bruno Bêche

Proceedings Volume 12139, 121390A (2022) https://doi.org/10.1117/12.2617996

KEYWORDS: Blood, Resonators, Optical lithography, Sensors, Waveguides, Plasmas, Integrated optics

Read Abstract +

Proceedings Article | 18 April 2021 Presentation + Paper

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

Read Abstract +

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

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

Read Abstract +

Proceedings Article | 18 April 2021 Poster + Presentation + Paper

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

Read Abstract +

Proceedings Article | 2 April 2020 Paper

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

Read Abstract +

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

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

Read Abstract +

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.

Proceedings Article | 26 July 2016 Presentation

Presentation

Nanosources and waveguiding in polymer-based nanowires and nanotubes (Conference Presentation)

Jean-Luc Duvail, Alexandre Garreau, John Bigeon, Nolwenn Huby, Bruno Bêche, Florian Massuyeau, Stéphane Cordier, Yann Molard, Eric Faulques

Proceedings Volume 9884, 98840Q (2016) https://doi.org/10.1117/12.2224440

KEYWORDS: Polymers, Nanowires, Light wave propagation, Visible radiation, Polymer multimode waveguides, Waveguides, Energy transfer, Semiconductors, Dielectrics, Control systems

Read Abstract +

Besides inorganic semiconducting and dielectric nanowires, the study of pi-conjugated and hybrid 1D-nanostructures is a fastly growing domain of research because of the great versatility offered by their architectures at the scale of the characteristic physical lengths. Novel nano-architectures give opportunities to control the optoelectronic properties, that could result in new paradigms for devices, such as nano-sources for tagging, sensing and lasing. Moreover, the 1D geometry promotes sub-wavelength optical propagation and cavity effects suitable for integrated nanophotonic devices (for a review, see [1]). Here, the color control in coaxial hybrid nanowires and the visible light propagation in polymeric nanotubes are reported, as well as nanosources combined within a single nanowire waveguide. In the first study, we propose an alternative strategy to get bright nano-emitters whose spectral emission can be precisely and simply anticipated. It consists in minimizing the role of charge and energy transfer mechanisms between the two species, in contrast to the common donor-acceptor strategy. In a practical way, the first key point is the selection of two luminophores with no overlapping in their absorption and emission spectral range. The second key point is the spatial separation of the two types of luminophores in a coaxial geometry to prevent charge and energy transfer. [2] For nanowires fabricated by a template strategy, this was achieved by first depositing nanotubes of a pi-conjugated green polymer with a solvent-assisted method. Then, the nanotubes were filled with a PMMA-red emitter composite. It has been shown that this strategy promotes a simple and fine tuning of the photoluminescence features with both species in similar concentration. These advantages could make our strategy a new paradigm for nano-emitters. In the second study, the propagation of light in the visible range along polymeric nanotubes has been investigated. The case of nanotubes is of particular interest because only few studies are reported in the literature and it permits higher interactions between the propagating light and both the surrounding medium and the inner channel, highly suited for nanosensors. The light was directly injected within nanotubes of SU-8 photoresist (a standard in integrated microdevices). The attenuation coefficient estimated by a cut-back like method has typical values of about 10 dB/cm. Simulation by FDTD has shown that most of the losses are due to leakages through the SiO2 substrate. [3] Thus, such polymeric nanowires and nanotubes are very competitive structures as sub-wavelength waveguides. Recent developments focused on combining fluorescent conjugated molecules within passive polymeric nanotubes will also be reported. [1] A. Garreau, J.L. Duvail Advanced Optical Materials 2, 1122-1140 (2014) [2] A. Garreau et al., ACS Nano 7, 2977–2987 (2013) [3] J. Bigeon, N. Huby, J.L. Duvail, B. Bêche, Nanoscale 6, 5309 (2014)

Proceedings Article | 2 May 2014 Paper

Paper

Direct injection in organic SU8 nanowires and nanotubes for waveguiding properties investigation

J. Bigeon, N. Huby, Jean-Luc Duvail, Bruno Bêche

Proceedings Volume 9126, 91263B (2014) https://doi.org/10.1117/12.2052517

KEYWORDS: Nanofibers, Polymers, Optical fibers, Nanostructures, Microlens, Finite-difference time-domain method, Scanning electron microscopy, Light wave propagation, Signal attenuation, Nanowires

Read Abstract +

Proceedings Article | 9 May 2012 Paper

Paper

Investigation on 2D disks and stadiums micro-resonators structures based on UV210 polymer

D. Pluchon, N. Huby, H. Lhermite, D. Duval, B. Beche

Proceedings Volume 8428, 84281Y (2012) https://doi.org/10.1117/12.922232

KEYWORDS: Waveguides, Polymers, Microresonators, Scanning electron microscopy, Lithography, Resonators, Geometrical optics, Deep ultraviolet, Wave propagation, Photomasks

Read Abstract +

Proceedings Article | 11 May 2010 Paper

Paper

Silica nano-ridges connections based on a fluidic approach for hybrid integrated photonics

B. Bêche, A. Jimenez, L. Courbin, L. Camberlein, F. Doré, D. Duval, F. Artzner, E. Gaviot

Proceedings Volume 7712, 77120H (2010) https://doi.org/10.1117/12.849177

KEYWORDS: Silica, Waveguides, Wave propagation, Integrated photonics, Ranging, Photonics, Visible radiation, Microfluidics, Integrated optics, Nanophotonics

Read Abstract +

Proceedings Article | 12 February 2010 Paper

Paper

Microfluidics and thin-film processes: a recipe for organic integrated photonics based on 3D microresonators

N. Huby, D. Pluchon, M. Belloul, A. Moreac, N. Coulon, E. Gaviot, P. Panizza, B. Bêche

Proceedings Volume 7604, 760407 (2010) https://doi.org/10.1117/12.836016

KEYWORDS: Microfluidics, Microresonators, Optical spheres, Waveguides, Thin films, Integrated photonics, Photonic devices, Resonators, Raman spectroscopy, Polymers

Read Abstract +

Proceedings Article | 18 May 2009 Paper

Paper

Spin coating and plasma process for 2.5D and hybrid 3D micro-resonators on multilayer polymers

B. Bêche, E. Gaviot, C. Godet, A. Zebda, A. Potel, J. Barbe, L. Camberlein, V. Vié, P. Panizza, G. Loas, C. Hamel, J. Zyss, N. Huby

Proceedings Volume 7356, 735606 (2009) https://doi.org/10.1117/12.820339

KEYWORDS: Waveguides, Polymers, Plasma, Multilayers, Microresonators, Plasma treatment, Coating, Argon, Spherical lenses, Liquids

Read Abstract +

Proceedings Article | 10 February 2009 Paper

Paper

New practical approach of integrated photonic based on biomimetic peptidic/silica self-assembled nanotubes

D. Duval, C. Tarabout, N. Huby, F. Artzner, E. Gaviot, J. Zyss, A. Renault, E. Pouget, B. Bêche

Proceedings Volume 7218, 721804 (2009) https://doi.org/10.1117/12.805500

KEYWORDS: Silica, Light wave propagation, Biomimetics, Integrated photonics, Molecular self-assembly, Waveguides, Integrated optics, Polymers, Thin films, Transmission electron microscopy

Read Abstract +

Proceedings Article | 29 August 2008 Paper

Paper

Integrated optics based on plasma processed dielectric materials

T. Begou, B. Bêche, J. P. Landesman, E. Gaviot, A. Soussou, K. Makaoui, M. P. Besland, A. Granier, A. Goullet

Proceedings Volume 7067, 706705 (2008) https://doi.org/10.1117/12.793690

KEYWORDS: Waveguides, Refractive index, Plasma, Plasma enhanced chemical vapor deposition, Titanium, Cladding, FT-IR spectroscopy, Integrated optics, Dielectrics, Titanium dioxide

Read Abstract +

Proceedings Article | 30 September 2005 Paper

Paper

Versatile SOG/SU-8/fluorinated SU-8 rib optical waveguides as microsystems: single-mode TE₀₀-TM₀₀ straight waveguides, S-bends, Y-junctions, Mach-Zehnder interferometers

B. Bêche, N. Pelletier, E. Gaviot, R. Hierle, P. Papet, F. Poncin-Epaillard, D. Debarnot, A. Goullet, A. Granier, C. Cardinaud, J.P. Landesman, J. Zyss

Proceedings Volume 5956, 59560V (2005) https://doi.org/10.1117/12.614103

KEYWORDS: Waveguides, Polymers, Integrated optics, Fluorine, Wave propagation, Plasma treatment, Polarization, Plasmas, Absorption, Optical testing

Read Abstract +

Showing 5 of 18 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement