A5058807850- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Force Microscopy Techniques and Applications
- Photonic and Optical Devices
- Quantum Electrodynamics and Casimir Effect
- Experimental and Theoretical Physics Studies
- Nanowire Synthesis and Applications
- Diamond and Carbon-based Materials Research
- Advanced Sensor and Energy Harvesting Materials
- Nanofabrication and Lithography Techniques
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- 3D Printing in Biomedical Research
- Neuroscience and Neural Engineering
- Semiconductor Lasers and Optical Devices
- Acoustic Wave Resonator Technologies
- Physics of Superconductivity and Magnetism
- Molecular Junctions and Nanostructures
- Gas Sensing Nanomaterials and Sensors
- NMR spectroscopy and applications
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Cellular Mechanics and Interactions
- Microwave Engineering and Waveguides
- Carbon Nanotubes in Composites
École Polytechnique Fédérale de Lausanne
2016-2023
Boston University
2009-2022
GlaxoSmithKline (Switzerland)
2020-2022
Material (Belgium)
2020-2021
Materials Science & Engineering
2020-2021
University of Illinois Urbana-Champaign
2021
University of Neuchâtel
2019
University of Bern
2004-2019
Low-voltage dielectric elastomer actuators propel an autonomous untethered subgram robust soft legged robot along complex paths.
We report measurements of synchronization in two nanomechanical beam oscillators coupled by a mechanical element. charted multiple regions frequency entrainment or their corresponding Arnold's tongue diagrams as the oscillator was driven at subharmonic and rational commensurate frequencies. Demonstration synchronized could be fundamentally important to neurocomputing with networks signal processing for microwave communication.
Abstract Systematic investigations of the effects mechano-electric coupling (MEC) on cellular cardiac electrophysiology lack experimental systems suitable to subject tissues in-vivo like strain patterns while simultaneously reporting changes in electrical activation. Here, we describe a self-contained motor-less device (mechano-active multielectrode-array, MaMEA) that permits assessment impulse conduction along bioengineered strands tissue response dynamic cycles. The is based...
We report actuation and detection of gigahertz-range resonance frequencies in nanocrystalline diamond mechanical resonators. High order transverse vibration modes are measured coupled-beam resonators exhibiting up to 1.441GHz. The cantilever-array design the translates resonant motion micron-long cantilever elements displacement central supporting structure. Use further increases frequency compared single crystal silicon by a factor 3. clamping losses usually associated with micron-sized...
MEMS micromirrors have proven to be very important optical devices with applications ranging from steerable mirrors for switches and cross-connects spatial light modulators correcting distortions. Usually beam steering focusing are done different tilt angles in excess of 10 degrees seldom obtained. Here we describe a single device that combines tip/tilt, piston mode varifocal capability into single, low cost large angles. Our consists 400 micron diameter mirror driven thermal bimorphs. We...
Dissipation of energy in micro- and nano-electromechanical resonators governs their dynamical response limits potential use device applications. Quantified by the quality factor Q, dissipation (Q−1) usually occurs loss mechanisms that are linear, appearing as a damping term proportional to velocity. Mechanisms linear nano-mechanical well studied both theoretically experimentally. nonlinear energy, however, rarely studied, though effects could be fundamentally important operation numerous...
We present a mechanically active cell culture substrate that produces complex strain patterns and generates extremely high rates. The transparent miniaturized stretcher is compatible with live microscopy provides very compact portable alternative to other systems. A monolayer cultured on dielectric elastomer actuator (DEA) made of 30 μm thick silicone membrane sandwiched between stretchable electrodes. potential difference several kV's applied across the electrodes generate electrostatic...
The Casimir Effect is a physical manifestation of quantum fluctuations the electromagnetic vacuum. When two metal plates are placed close together, typically much less than micron, long wavelength modes between them frozen out, giving rise to net attractive force plates, scaling as
Extensive measurements have been made with pions, electrons and muons on four production wedges of the compact muon solenoid (CMS) hadron barrel (HB) calorimeter in H2 beam line at CERN particle momenta varying from 20 to 300 GeV/c. The time structure events was measured full chain preproduction front-end electronics running 34 MHz. Moving-wire radioactive source data were also collected for all scintillator layers HB. energy dependent slewing effect tuned optimal performance.
We report the observation of nonlinear dissipation in diamond nanomechanical resonators measured by an ultrasensitive heterodyne down-mixing piezoresistive detection technique. The combination a hybrid structure as well symmetry breaking clamps enables sensitive multiple orthogonal modes resonator over wide frequency and temperature range. Using this method, we observe transition from purely linear at room to strongly cryogenic temperatures. At high drive powers below liquid nitrogen...
Micro/nanoelectromechanical systems (MEMS/NEMS) provide the engineer with a powerful set of solutions to wide variety technical challenges. However, because they are mechanical systems, response times can be limitation. In some situations, advanced engineered drive techniques improve by as much thousand fold, significantly opening up application space for MEMS/NEMS solutions.
We demonstrate a silicon-based high-frequency nanomechanical device capable of switching controllably between two states at room temperature. The uses resonator with distinct in the hysteretic nonlinear regime. In contrast to prior work, we room-temperature electrostatic actuation and sensing 100% fidelity by phase modulating drive signal. This phase-modulated can be used as low-power, high-speed mechanical switch integrated on-chip silicon circuitry.
Integrated circuits with nanomaterial components can revolutionize technology, but only if they be economically fabricated in large numbers.
We present a microelectromechanical systems (MEMS) tunable metamaterial, Fabry-Pérot interferometer with widely mid-infrared response. An array of subwavelength holes in gold film is suspended above reflector, forming an cavity whose length can be modulated over range 1.7 to 21.67 μm using MEMS electrostatic actuation. Reflectance spectra exhibit the convolution extraordinary optical transmission through and resonances free spectral ranges from 2900 230.7 cm–1. Measuring enables us perform...
The authors report frequency and dissipation scaling laws for doubly clamped diamond resonators. device lengths range from 10to19μm corresponding to quality-factor ranges of 17to66MHz 600–2400, respectively. find that the resonance scales as 1∕L2 confirming validity thin-beam approximation. dominant comes two sources: shorter beams, clamping loss is mechanism, while longer surface losses provide a significant source dissipation. compare contrast these mechanisms with other describe data.
We report kelvin- to millikelvin-temperature measurements of dissipation and frequency shift in megahertz-range resonators fabricated from ultrananocrystalline diamond. Frequency $\ensuremath{\delta}f/{f}_{0}$ ${Q}^{\ensuremath{-}1}$ demonstrate temperature dependence the millikelvin range similar that predicted by glass model tunneling two-level systems. The logarithmic is good agreement with such models, which include phonon relaxation resonant absorption. Dissipation shows a weak power...
We present a microelectromechanical system (MEMS) based method for the resist-free patterning of nanostructures. Using focused ion beam to customize larger MEMS machines, we fabricate apertures with features less than 50 nm in diameter on plates that can be moved nanometer precision over an area greater 20 × μm(2). Depositing thermally evaporated gold atoms though while moving plate results deposition nanoscale metal patterns. Adding shutter positioned micrometers above aperture enables high...
Abstract The Casimir force, a quantum mechanical effect, has been observed in several microelectromechanical system (MEMS) platforms. Due to its extreme sensitivity the separation of two objects, force proposed as an excellent avenue for metrology. Practical application, however, is challenging due attractive forces leading stiction and device failure, called pull-in. In this work, we design simulate Casimir-driven metrology platform, where time-delay-based parametric amplification technique...
Source–writer–sensor components of the Fab on a Chip.
Capacitive comb actuators are widely used as MEMS motors due to their long range of linear motion, low power consumption, and ease fabrication. Here, we present data from a thin capacitive actuator where fringe fields contribute significantly the device performance. We characterize observed levitation effect discuss two methods control out-of-plane forces: 1) by means alternating polarity; 2) using an additional electrode below comb. Considering alternative designs, it is shown how force can...
In this paper, we discuss a design for MEMS parametric amplifier modulated by the Casimir force. We present theory such device and show that it allows implementation of very sensitive voltage measuring technique, where amplitude high quality factor resonator includes tenth power dependency on an applied DC voltage. This approach opens up new powerful modality, applicable to other measurement types.
Microelectromechanical systems (MEMS) provide engineers with a rich palette of technical solutions to wide range actuation and sensing challenges. MEMS devices are low cost, easily integrated sense drive electronics, robust, can be designed respond electrical, mechanical, or chemical stimuli. Because they suffer from being relatively slow in comparison purely electronic devices. However, it has been shown that by using feedforward drives developed controls theory approaches, is possible...
Abstract In this paper, we discuss using the Casimir force in conjunction with a MEMS parametric amplifier to construct quantum displacement amplifier. Such mechanical converts DC displacements into much larger AC oscillations via gain of system which, some cases, can be factor million or more. This would allow one build chip scale metrology systems zeptometer positional resolution. approach leverages fluctuations device sensitivity that can’t obtained classical systems.