Concept
Diapason
Publications associées (69)
Piezoelectric thin films on Quartz substrate
The aim of this project is to deposit a thin film of aluminum nitride (AlN) or aluminum scandium nitride (AlScN) on a quartz substrate showing good piezoelectric properties for use in tuning fork oscillators. Quartz oscillators are commonly used in various ...
2023A Wide-Frequency-Tuning Micro-Loop-Gap Resonator for Miniature Rubidium Vapor-Cell Atomic Frequency Standards
To miniaturize the double-resonance (DR) rubidium (Rb) vapor-cell atomic clocks, a new type of micro-loop-gap microwave resonator (mu-LGR) is proposed for TE011-like mode where the magnetic field inside the cavity is homogeneous and oriented along its long ...
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2023Cysteine-Cysteine Cross-Conjugation of both Peptides and Proteins with a Bifunctional Hypervalent Iodine-Electrophilic Reagent
Jérôme Waser, Stefano Nicolai, Abhaya Kumar Mishra
Peptide and protein bioconjugation sees ever-growing applications in the pharmaceutical sector. Novel strategies and reagents that can address the chemo- and regioselectivity issues inherent to these biomolecules, while delivering stable and functionalizab ...
Weinheim2023Shaking force balancing of a 2-DOF isotropic horological oscillator
Simon Nessim Henein, Hubert Pierre-Marie Benoît Schneegans, Etienne Frédéric Gabriel Thalmann
Despite centuries of research and significant advances, the escapement mechanism used to count and maintain oscillations of mechanical time bases remains a complex mechanism and a major source of energy losses. We showed in previous work that, instead of t ...
2021Basic design considerations for a frequency step-tunable electron cyclotron wave system to suppress NTMs in DEMO
Minh Quang Tran, Emiliano Fable, Hartmut Zohm, Emanuele Poli, Konstantinos Avramidis, Giovanni Tardini
An Electron Cyclotron Wave (ECW) system will be used in the European DEMO for the stabilization of Neoclassical Tearing Modes (NTMs). In order to avoid movable mirrors in the harsh environment close to the plasma and to simplify the NTM launcher integratio ...
ELSEVIER SCIENCE SA2021Flexure Pivot Oscillators for Mechanical Watches
Etienne Frédéric Gabriel Thalmann
It appears that the concerted efforts of the watchmaking industry are leading towards a limit in mechanical watch accuracy. The general consensus in horology is that the time base's quality factor, a dimensionless number that characterizes the oscillator d ...
EPFL2020Thermo-optic tuning of spectral broadening in a nonlinear Ultra-Silicon-Rich Nitride grating
Temperature tuning of spectral broadening induced by a nonlinear grating is experimentally demonstrated. The bandwidth is observed to decrease as temperature increases, corresponding to a red-shift in the high dispersion region of the Bragg grating. ...
IEEE2020Scanning near-field optical microscopy with new probes and feedback modes
Scanning Near-field Optical Microscopy (SNOM) technique enables to overcome Abbe diffraction limit of far-field optics as well as to obtain simultaneously optical and topographical images. While the optical resolution of the method is limited by the apertu ...
EPFL2019Crystal Phase Tuning in Planar Films of III-V Semiconductors
Anna Fontcuberta i Morral, Kirsten Emilie Moselund, Nicolas Tappy
We report on the control of the crystal phase of micron-sized planar III-V semiconductor films grown on top of standard (001) oriented substrates. We achieve this by confining the MOCVD process using SiO2 templates and selecting specific growth planes. We ...
IEEE2019Long-life plastic optical fiber probes for scanning near-field optical microscope
Giovanni Dietler, Anton Smirnov, Ekaterina Rostova
Nowadays, sharpened glass fiber - made probes attached to a quartz tuning fork (TF) and exploiting the shear force - based feedback are by far the most popular in the field of SNOM. These probes are expensive, very fragile and their fabrication is difficul ...
SPIE-INT SOC OPTICAL ENGINEERING2018