Prof. Bruno Bêche Profile

Prof. Bruno Bêche

at Univ de Rennes 1

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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 ...

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

Proc. SPIE. 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications

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

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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

Proc. SPIE. 10678, Optical Micro- and Nanometrology VII

KEYWORDS: Microresonators, Deep ultraviolet, Resonators, Waveguides, Cladding, Sensors, Polymers, 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.

Proceedings Article | 26 July 2016 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

Proc. SPIE. 9884, Nanophotonics VI

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

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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

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

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

Proc. SPIE. 9126, Nanophotonics V

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

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Proceedings Article | 9 May 2012 Paper

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

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

Proc. SPIE. 8428, Micro-Optics 2012

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

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Proceedings Article | 11 May 2010 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

Proc. SPIE. 7712, Nanophotonics III

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

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Proceedings Article | 12 February 2010 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

Proc. SPIE. 7604, Integrated Optics: Devices, Materials, and Technologies XIV

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

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Proceedings Article | 18 May 2009 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

Proc. SPIE. 7356, Optical Sensors 2009

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

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Proceedings Article | 10 February 2009 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

Proc. SPIE. 7218, Integrated Optics: Devices, Materials, and Technologies XIII

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

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Proceedings Article | 29 August 2008 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

Proc. SPIE. 7067, Advances in Thin-Film Coatings for Optical Applications V

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

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Proceedings Article | 30 September 2005 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

Proc. SPIE. 5956, Integrated Optics: Theory and Applications

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

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