Publications by Stefan Metz | EPFL Graph Search

On the Similarity of Electric Field Signatures of Upward and Downward Negative Leaders

Farhad Rachidi-Haeri, Marcos Rubinstein, Stefan Metz, Davide Pavanello, Mohammad Azadifar

2018

On Lightning Electromagnetic Field Propagation Along an Irregular Terrain

Farhad Rachidi-Haeri, Marcos Rubinstein, Stefan Metz, Davide Pavanello, Mario Paolone, Mohammad Azadifar, Dongshuai Li, Zhaoyang Wang, Qilin Zhang

In this paper, we present a theoretical analysis of the propagation effects of lightning electromagnetic fields over a mountainous terrain. The analysis is supported by experimental observations consisting of simultaneous records of lightning currents and ...

Institute of Electrical and Electronics Engineers2016

Fast Initial Continuous Current Pulses vs Return Stroke Pulses in Tower-initiated Lightning

Farhad Rachidi-Haeri, Marcos Rubinstein, Stefan Metz, Davide Pavanello, Mario Paolone, Mohammad Azadifar

We present a study focused on pulses superimposed on the initial continuous current of upward negative discharges. The study is based on experimental data consisting of correlated lightning current waveforms recorded at the instrumented Santis Tower in Swi ...

Amer Geophysical Union2016

Characteristics of Electric Fields of Upward Negative Stepped Leaders

Farhad Rachidi-Haeri, Marcos Rubinstein, Stefan Metz, Davide Pavanello, Mario Paolone, Carlos Alberto Romero Romero, Mohammad Azadifar

2015

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

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

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

Polyimide microfluidic devices with integrated nanoporous filtration areas manufactured by micromachining and ion track technology

Philippe Renaud, Arnaud Bertsch, Stefan Metz

This paper reports on polyimide microfluidic devices fabricated by photolithography and a layer transfer lamination technology. The microchannels are sealed by laminating an uncured polyimide film on a partially cured layer and subsequent imidization. Sele ...

2004

Polyimide and SU-8 microfluidic devices manufactured by heat- depolymerizable sacrificial material technique

Philippe Renaud, Arnaud Bertsch, Stefan Metz, Sébastien Jiguet

The following paper describes a sacrificial layer method for the manufacturing of microfluidic devices in polyimide and SU-8. The technique uses heat-depolymerizable polycarbonates embedded in polyimide or SU-8 for the generation of microchannels and seale ...

2004

Polyimide-based microfabrication technologies for microelectrodes and microfluidic devices in biomedical engineering

Stefan Metz

EPFL2003

Flexible microchannels with integrated nanoporous membranes for filtration and separation of molecules and particles

Philippe Renaud, Arnaud Bertsch, Stefan Metz

This paper reports on the technology development and characterization of polyimide-based, microfluidic channels with integrated nanoporous membranes. A layer transfer and lamination technique is used to fabricate flexible microchannels from spin-on polyimi ...

2002

Fabrication of flexible, implantable microelectrodes with embedded fluidic microchannels

Philippe Renaud, Raphael Holzer, Stefan Metz

This paper describes the fabrication of polyimide-based microelectrodes with embedded fluidic microchannels. The thin-film structures combine for the first time a fluidic system with microelectrodes for recording and stimulation of biological signals on a ...

2001

Polyimide-based microfluidic devices

Philippe Renaud, Raphael Holzer, Stefan Metz

This paper describes the development of polyimide-based microfluidic devices. A layer transfer and lamination technique is used to fabricate flexible microfluidic channels in various shapes and with a wide range of dimensions. High bond strengths can be ac ...

2001

Fabrication and test of implantable thin-film electrodes for stimulation and recording of biological signals

Philippe Renaud, Raphael Holzer, Stefan Metz

The fabrication, characterization and application of polyimide-based flexible microelectrodes for recording from and stimulation of biological tissue are described. The planar electrodes consist of a polyimide-platinum-polyimide sandwich structure with a t ...

2000