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Philippe Renaud

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Publications associées (301)

CMOS pixels for subretinal implantable prothesis

Philippe Renaud, Mihai Adrian Ionescu, Marco Mazza

This work reports on the design, fabrication, and characterization of CMOS pixels for subretinal implants, which seems to be an effective way to recover visual capabilities in some types of blindness. Two possible approaches are presented for CMOS pixel im ...

2005

Partial release and detachment of microfabricated metal and polymer structures by anodic metal dissolution

Philippe Renaud, Arnaud Bertsch, Stefan Metz

The large majority of microelectromechanical systems (MEMS) are fabricated on silicon, glass or Pyrex substrates by manufacturing techniques, which originated from the semiconductors industry. However, their final application often requires removal of the ...

Institute of Electrical and Electronics Engineers2005

Fabrication of vertical digital silicon optical micromirrors on suspended electrode for guided-wave optical switching applications

Philippe Renaud, Philippe Flückiger, Cyrille Hibert, Roland Guerre

This paper presents a novel technological and design study of optical guided- wave MicroElectroMechanical Systems (MEMS) switch. We work on a concept of hermetic assembly in which a MEMS wafer is covered (top-down) by a crossing optical waveguide wafer. Th ...

2005

Monitoring stem cell growth using a microelectrode array

Philippe Renaud, Yann Barrandon, Olof Pontus Linderholm

2005

Ionic transport phenomena in nanofluidics: Experimental and theoretical study of the exclusion-enrichment effect on a chip

Philippe Renaud, Reto Bruno Schoch

In nanometer-sized apertures with charged surfaces, the extension of the electrical double layer results in the electrostatic exclusion of co-ions and enrichment in counterions, which affects the permselectivity of such structures. A modeling of this pheno ...

American Chemical Society (ACS)2005

Effect of the surface charge on ion transport through nanoslits

Philippe Renaud, Harald Van Lintel, Reto Bruno Schoch

A description of ion transport through geometrically defined nanoslits is presented. It is characterized by the effective surface charge density and was obtained by impedance spectroscopy measurements of electrolytes with different physico-chemical propert ...

2005

Temperature measurements in microfluidic systems: Heat dissipation of negative dielectrophoresis barriers

Philippe Renaud, Martin Jordan, Silvan Schnydrig, Urban Seger

The manipulation of living biological cells in microfluidic channels by a combination of negative dielectrophoretic barriers and pressure-driven flows is widely employed in lab-on-a-chip systems. However, electric fields in conducting media induce Joule he ...

2005

Gentle cell trapping and release on a microfluidic chip by in situ alginate hydrogel formation

Philippe Renaud, Lynda Metref, Thomas Michael Braschler

Microfluidic devices are increasingly used to perform biological experiments on a single-cell basis. However, long-term stability of cell positions is still an issue. A novel biocompatible method for cell entrapment and release on a microchip is presented. ...

2005

Tunable Oscillating CMOS Pixel for Subretinal Implants

Philippe Renaud, Mihai Adrian Ionescu, Marco Mazza

2005

Ion transport through nanoslits investigated by impedance spectroscopy

Philippe Renaud, Stefan Metz, Reto Bruno Schoch

We present a description of ion transport through geometrically defined nanoslits. The description was obtained through impedance spectroscopy measurements of electrolytes with different physico-chemical parameters. The number of 50 nm high nanoslits prese ...

2005

Impedance spectroscopy flow cytometry: On-chip label-free cell differentiation

Shady Didier Gawad, Philippe Renaud, Karen Cheung

Background: The microfabricated impedance spectroscopy flow cytometer used in this study permits rapid dielectric characterization of a cell population with a simple microfluidic channel. Impedance measurements over a wide frequency range provide informati ...

2005

Conductive SU8 Photoresist for Microfabrication

Heinrich Hofmann, Philippe Renaud, Arnaud Bertsch, Sébastien Jiguet

A conductive composite photoresist has been developed for the direct photopatterning of electrodes. It is based on a dispersion of silver nanoparticles in SU8, a non-conductive, negative-tone photoresist. Manufactured structures have an electrical conducti ...

2005

Ion transport through nanoslits dominated by the effective surface charge

Philippe Renaud, Reto Bruno Schoch

A model showing the importance of the parameters characterizing ion transport through geometrically defined nanoslits filled with electrolyte is presented. A conductance plateau sin log-log scaled at low salt concentrations in the nanometer-sized apertures ...

AIP American Institute of Physics2005

Cell immersion and cell dipping in microfluidic devices

Shady Didier Gawad, Philippe Renaud, Arnaud Bertsch, Urban Seger

Combining deflective dielectrophoretic barriers with controlled pressure driven liquid flows in microfluidic devices allows accurate handling of particles such as biological cells in suspensions. Working towards cell-based lab-on-a-chip applications, a pla ...

2004

SU8-silver photosensitive nanocomposite

Heinrich Hofmann, Philippe Renaud, Arnaud Bertsch, Sébastien Jiguet

2004

Profile angle control in SIO2 deep anisotropic dry etching for MEMS fabrication

Philippe Renaud, Philippe Flückiger, Cyrille Hibert

We report a recent breakthrough to control profile angle for SiO2 Deep Anisotropic Dry Etching (SDADE). Our study reveals that gas residence time is the key parameter to control profile angle. Moreover, we show that it is possible to control profile angle, ...

2004

Flexible polyimide probes with microelectrodes and embedded microfluidic channels for simultaneous drug delivery and multi-channel monitoring of bioelectric activity

Philippe Renaud, Arnaud Bertsch, Stefan Metz

The study of intracellular communication requires devices that can not only monitor the bioelectric activity, but also control and observe the biochemical environment at the cellular level. This paper reports on the development and characterisation of impl ...

Elsevier2004

A simple mechanism for reliable particle sorting in a microdevice with combined electroosmotic and pressure-driven flow

Philippe Renaud

Selective transport and sorting of particles in microfluidic devices by electroosmosis is complicated due to superposition of uncontrolled hydrodynamic pressure contributions on the electroosmotic force. In this paper, we present a microfluidic concept for ...

2004

High tuning range AlSi RF MEMS capacitors fabricated with sacrificial amorphous silicon surface micromachining

Michel Declercq, Philippe Renaud, Catherine Dehollain, Raphaël Fritschi, Philippe Flückiger, Mihai Adrian Ionescu, Cyrille Hibert, Florin Udrea, Dimitrios Tsamados

This paper reports the fabrication and electrical characterization of high tuning range AlSi RF MEMS capacitors. We present experimental results obtained by a surface micromachining process that uses dry etching of sacrificial amorphous silicon to release ...

2004

First steps toward noninvasive intraocular pressure monitoring with a sensing contact lens

Matteo Leonardi, Philippe Renaud, Arnaud Bertsch

PURPOSE. To present a novel and minimally invasive approach to intraocular pressure (IOP) monitoring based on a sensing contact lens. METHODS. The key element of this measurement method is a soft contact lens with an embedded microfabricated strain gauge a ...

2004

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