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Proceedings Paper

Micro-mirror array for multi-object spectroscopy
Author(s): Frederic Zamkotsian; Severin Waldis; Wilfried Noell; Kacem ElHadi; Patrick Lanzoni; Nico de Rooij
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Paper Abstract

Next generation MOS for space as well as ground-based instruments, including NIRSpec for JWST, require a programmable multi-slit mask. A promising solution is the use of MOEMS-based devices such as micromirror arrays (MMA) or micro-shutter arrays (MSA). Both configurations allow remote control of the multi-slit configuration in real time. Engaged in the design studies for NIRSpec, we have developed different tools for the modelling and the characterization of these devices. Since, we have continued our studies with commercial TI MMA and we show that in a 20° ON-OFF configuration, the 3000 contrast requirement is fulfilled for any F# of 8m-class telescopes as well as future ELT's. Within the framework of the JRA on Smart Focal Planes, micro-mirrors have been selected in order to get a first demonstrator of a European MOEMS-based slit mask. We have fixed several key parameters: one micromirror per astronomical object, high optical contrast of at least 3000, tilting angle of 20°, fill factor of more than 90%, size of a micro-element around 100 × 200 μm2, driving voltage below 100V. The MMA would also work in a wide range of temperature down to cryogenic temperatures. Based on these parameters, we have designed a new MMA architecture, using a combination of bulk and surface micromachining. A first small test array of micro-mirrors was successfully fabricated and shows the desired mechanical tilting angle of 20° at a driving voltage of about 100V. Preliminary measurements show a surface quality better than lambda/20. Assembly of small test arrays with their electrode chips and design of larger arrays are under way.

Paper Details

Date Published: 6 July 2006
PDF: 9 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62731Q (6 July 2006); doi: 10.1117/12.671911
Show Author Affiliations
Frederic Zamkotsian, Lab. d'Astrophysique de Marseille (France)
Severin Waldis, IMIT, Univ. of Neuchatel (Switzerland)
Wilfried Noell, IMIT, Univ. of Neuchatel (Switzerland)
Kacem ElHadi, Lab. d'Astrophysique de Marseille (France)
Patrick Lanzoni, Lab. d'Astrophysique de Marseille (France)
Nico de Rooij, IMIT, Univ. of Neuchatel (Switzerland)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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