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Wilfried Noell

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Publications associées (35)

Interferometric study on Gouy phase anomaly of microlens array

Hans Peter Herzig, Wilfried Noell, Myun Sik Kim, Toralf Scharf

We investigate the Gouy phase anomaly of light in the focus of refractive plano-convex microlens arrays by using longitudinal-differential (LD) interferometry and a finite-difference time-domain (FDTD) simulation. We put emphasis on determining the amount ...

Spie-Int Soc Optical Engineering2015

The two-dimensional array of 2048 tilting micromirrors for astronomical spectroscopy

Nico de Rooij, Michael David Canonica, Wilfried Noell

In multi-object spectrometers, field selectors, which are located in the focal plane of the telescopes, are required for the selection of astronomical objects, such as stars or faint galaxies. We present a two-dimensional micromirror array as a field selec ...

Institute of Physics2013

A dual-axis pointing mirror with moving-magnet actuation

Nico de Rooij, Wilfried Noell, Caglar Ataman, Sébastien Lani

A large-aperture and large-angle MEMS-based 2D pointing mirror is presented. The device is electromagnetically actuated by a moving-magnet/stationary-coil pair and potentially suited for high power laser beam shaping and beam pointing applications, such as ...

Institute of Physics2013

Optical characterization of fully programmable MEMS diffraction gratings

Michael David Canonica, Wilfried Noell, Robert Andrew Lockhart

We have fabricated and characterized fully programmable diffraction gratings consisting of 64 silicon micro-mirrors. The mirrors are 700 mu m long and 50 mu m wide with a fill factor of 90%. They are actuated electrostatically and move down by 1.25 mu m wh ...

Optical Society of America2012

Large micromirror array designed and tested for Multi-Object Spectroscopy

Michael David Canonica, Wilfried Noell

MEMS-based programmable slit masks are developed for multi-object spectroscopy in astronomy. Devices with 2048 tiltable micromirrors were fabricated and tested, exhibiting very good surface flatness, high contrast and cryogenic operation ability. ...

Ieee2012

Large micromirror array for generating programmable slit masks for Multi-Object Spectroscopy

Nico de Rooij, Michael David Canonica, Wilfried Noell

Multi-object spectroscopy (MOS) is a powerful tool for space and ground-based telescopes for the study of the formation and evolution of galaxies. This technique requires a programmable slit mask for astronomical object selection. We are engaged in a Europ ...

Spie-Int Soc Optical Engineering2012

Spectral phase, amplitude, and spatial modulation from ultraviolet to infrared with a reflective MEMS pulse shaper

Nico de Rooij, Jean-Pierre Wolf, Fabio Jutzi, Wilfried Noell, Luigi Bonacina, Sébastien Lani, Jérôme Extermann

We describe the performance of a reflective pulse-shaper based on a Micro-ElectroMechanical System (MEMS) linear mirror array. It represents a substantial upgrade of a preceding release [Opt. Lett. 35, 3102 (2010)] as it allows simultaneous piston and tilt ...

Optical Society of America2011

Design, simulation, fabrication, packaging, and characterization of a MEMS-based mirror array for femtosecond pulse-shaping in phase and amplitude

Nico de Rooij, Jean-Pierre Wolf, Fabio Jutzi, Wilfried Noell, Luigi Bonacina, Sébastien Lani, Jérôme Extermann

We present an in-detail description of the design, simulation, fabrication, and packaging of a linear micromirror array specifically designed for temporal pulse shaping of ultrashort laser pulses. The innovative features of this device include a novel comb ...

American Institute of Physics2011

Fabrication and characterization of linear diffusers based on concave micro lens arrays

Nico de Rooij, Hans Peter Herzig, Wilfried Noell, Roland Andreas Bitterli, Toralf Scharf

We present a new approach of beam homogenizing elements based on a statistical array of concave cylindrical microlens arrays. Those elements are used to diffuse light in only one direction and can be employed together with fly’s eye condensers to generate ...

Optical Society of America2010

Scalable cascaded snap-in actuators for large-stroke displacements

Nico de Rooij, Wilfried Noell, Yves Pétremand, Nicolas Bernard Golay

This paper will focus on the design, and first measurements of a cascaded in-plane parallel plate snap-in actuator. The actuator is based on a rather simple microfabrication process and can achieve a total displacement of several tenths of microns. Compare ...

2009

6Dynamic MEMS-based linear (1D) diffusers for laser beam homogenizing and beam shaping

Nico de Rooij, Wilfried Noell, Jonathan Masson

2009

Dynamic array spot shaping for laser micro machining

Wilfried Noell, Roland Andreas Bitterli, Toralf Scharf, Jonathan Masson

2009

Thermal Characterization of Polycrystalline CVD Diamond Thin Films

Nico de Rooij, Wilfried Noell, Danick Briand, Caglar Ataman, Sébastien Lani

An experimental thermal characterization method is developed for high thermal conductivity thin films. The method utilizes Ta/Pt resistors on microfabricated free-standing thin film structures both for heating and temperature monitoring at different positi ...

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2009

Tunable MEMS-based Optical Linear(1D)Diffusers for Dynamic Laser Beam Shaping and Homogenizing

Nico de Rooij, Wilfried Noell, Jonathan Masson

2009

MEMS for space

Nico de Rooij, Wilfried Noell, Herbert Shea, Danick Briand, Sebastian Gautsch

Future space exploration will emphasize on cost effectiveness and highly focused mission objectives. Missions costs are directly proportional to its total weight, thus, the trend will be to replace bulky and heavy components of space carriers, communicatio ...

2009

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