A5003872387- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Acoustic Wave Resonator Technologies
- Acoustic Wave Phenomena Research
- Optical Coherence Tomography Applications
- Photoacoustic and Ultrasonic Imaging
- Photonic and Optical Devices
- Adhesion, Friction, and Surface Interactions
- Ultrasonics and Acoustic Wave Propagation
- Biosensors and Analytical Detection
- Force Microscopy Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- Oral Health Pathology and Treatment
- Semiconductor Lasers and Optical Devices
- Geotechnical and Geomechanical Engineering
- Optical Coatings and Gratings
- Advanced Surface Polishing Techniques
- Advanced optical system design
- Advanced Biosensing Techniques and Applications
- Laser Material Processing Techniques
- Blood groups and transfusion
- Head and Neck Cancer Studies
Université de franche-comté
2009-2024
Centre Hospitalier Universitaire de Besançon
2013-2024
Imagerie Médicale et Radiothérapie Drôme Ardèche
2023
Centre National de la Recherche Scientifique
2008-2021
Université de Bourgogne
2017-2021
Franche-Comté Électronique Mécanique Thermique et Optique - Sciences et Technologies
2010-2021
Université Bourgogne Franche-Comté
2018-2021
University of Florida
2018-2020
Beijing Institute of Technology
2018
Carnegie Mellon University
2018
We report on the direct observation of trapping and guiding surface-guided elastic waves in a linear defect introduced into micron-scale phononic crystal. Elastic field amplitude detection using laser scanning interferometry was used to characterize different transmission regimes one-period wide line crystal structure as function frequency discriminate waveguiding from outside band gap. Surface density-of-states computations support experimental observations.
Laser scanning based on Micro-Electro-Mechanical Systems (MEMS) scanners has become very attractive for biomedical endoscopic imaging, such as confocal microscopy or Optical Coherence Tomography (OCT). These are required to be fast achieve real-time image reconstruction while working at low actuation voltage comply with medical standards. In this context, we report a 2-axis electrothermal micro-scannercapable of imaging large fields view high frame rates, e.g. from 10 80 frames per second....
We observe experimentally the propagation of surface-guided waves in a hypersonic phononic crystal, both radiative and nonradiative regions spectrum. Combining electrical measurements reflection transmission as well optical maps surface displacement, band gap extending from 0.6 to 0.95 GHz is identified square lattice array 1 μm radius air holes milled lithium niobate. The reveal above gap, inside sound cone.
Interaction of a micromechanical resonator with supporting surface is usually seen as an intense source loss, and thus detrimental. However, in analogy to plasmonics, one can imagine using phononic chains carry elastic energy subwavelength structures. The authors show that resonator-surface coupling be used manipulate mechanical vibrations, reporting strong confinement cylindrical pillars dimensions 1/10 the excitation wavelength or less. Individual resonators ensembles addressed...
Manipulation of mechanical motion at the micro-scale has been attracting continuous attention, leading to successful implementation various strategies with potential impact on classical and quantum information processing. We here propose an approach based interplay between a pair localized resonators travelling surface acoustic waves (SAW). demonstrate existence two-sided interaction, allowing use SAW trigger control resonator oscillation, manipulate elastic energy distribution substrate...
Abstract Objective To evaluate the potential of autofluorescence spectroscopy as a real-time intraoperative tool for cholesteatoma detection and differentiation from surrounding non-cholesteatoma middle-ear tissues. Study Design Prospective ex vivo study. Setting Besançon University Hospital, France (tertiary care center). Methods Autofluorescence spectral scans were obtained middle ear biopsies following 405-nm laser excitation. Histopathologic analysis confirmed tissue classification....
This paper introduces an optical 2-axis Micro Electro-Mechanical System (MEMS) micromirror actuated by a pair of electrothermal actuators and set passive torsion bars. The element is dual-reflective circular mirror plate 1 m in diameter. inner connected to rigid frame via bars two diametrically opposite ends located on the rotation axis. A bimorphs generates force onto perpendicular free same angular direction. An array bimorph cantilevers deflects around working angle 45 ∘ for side-view...
We report on the fabrication of micro-axicons made glass by laser-assisted wet etching (LAE) and laser polishing. The employed technique, relying a direct-writing process using femtosecond laser, allows revealing high fidelity profiles when exposed samples are etched in heated potassium hydroxide (KOH) solution. remaining surface roughness is then decreased carbon dioxide (CO2) Such polishing limited to superficial layer component so that tip only slightly rounded, with radius curvature...
Abstract Background Autofluorescence spectroscopy is effective for noninvasive detection but underutilized in tissue with various pathology analyses. This study evaluates whether AFS can be used to discriminate between different types of laryngeal lesions view assisting vocal fold surgery and preoperative investigations. Methods A total 1308 spectra were recorded from 29 samples obtained 23 patients. Multiclass analysis was performed on the spectral data, categorizing into normal, benign,...
OCT instruments permit fast and non-invasive 3D optical biopsies of biological tissues. However, they are bulky expensive, making them only affordable at the hospital thus, not sufficiently used as an early diagnostic tool. Significant reduction system cost size is achieved by implementation MOEMS technologies. We propose active array 4x4 Mirau microinterferometers where reference micro-mirrors carried a vertical comb-drive microactuator, enabling phase-shifting technique that improves...
In the rapid evolution of gastrointestinal endomicroscopy, optical coherence tomography (OCT) has found many diverse applications. Until recently, micro-opto-electro-mechanical systems (MOEMS) technology been playing a key role in shaping miniaturization these components. We report here, to best our knowledge, novel endoscopic microsystem. It is based on spectrally tuned MOEMS Mirau micro-interferometer integrated with micro-electro-mechanical (MEMS) electro-thermal micro-scanner, operating...
The rising need for hybrid physical platforms has triggered a renewed interest in the development of agile radio-frequency phononic circuits with complex functionalities. combination traveling waves resonant mechanical elements appears as an appealing means harnessing elastic vibration. In this work, we demonstrate that can be further enriched by occurrence surface acoustic (SAWs), induced nonlinearities, interacting pair otherwise linear micron-scale resonators. Reduction resonator-gap...
A phononic crystal exhibiting a band gap in the near-gigahertz frequency range for surface acoustic waves was fabricated lithium niobate substrate. Reflection and transmission properties of sample were characterized both electrically optically, by means embedded broadband interdigital transducers optical heterodyne interferometry, respectively. Measurements performed (XZ) propagating show existence between 660 900 MHz. Optical measurements confirm that behaves as perfect mirror at...
Systems for imaging require to employ high quality optical components in order dispose of aberrations and thus reach sufficient resolution. However, well-known methods get rid aberrations, such as aspherical profiles or diffractive corrections are not easy apply micro-optics. In particular, some these rely on polymers which cannot be associated when lenses used integrated devices requiring temperature process their further assembly separation. Among the different approaches, most common is...
In this article, we report on the simulation and realization of a magnetic circuit allowing to apply an axial field higher than 1 T. The proposed electromagnet is used investigate influence polarization behavior vertical-cavity-surface-emitting laser (VCSEL). A non-linear can be experimentally observed for currents as low threshold current, provided that strong enough.
In this paper, we report on studies aimed at sensing the stiffness of biological membranes, in particular case lipidic vesicles. To obtain pertinent results, have developed and checked a specific sensor based vibrating sphere. The near-field acoustic wave generated by sphere enables us to characterize particles which change apparent viscosity density surrounding fluid. microsphere is well suited for very small volumes liquid (typically about few microlitres). experimental results demonstrate...
The characterization of a MOEMS endoscopic OCT probe is presented. Its capacity to perform Lissajous scanning and imaging confirms that the able produce 3D images in real-time.
In France, before each transfusion, ABO compatibility test is required. The ultimate pre-transfusion manually performed by means of a dedicated card and interpreted nurses at the patient bedside. Despite this manual test, blood transfusion accidents still exist. Today, no bedside completely reliable current procedure does not prevent human errors. We propose new opto-ftuidic device based on concept protein biochips optical detection. Biochips, playing same role as reaction zones cards, are...