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Proceedings Paper

Design, characterization, and control of a large aperture MOEMS Fabry-Perot tunable infrared filter
Author(s): Jeremy A. Palmer; Wen-Ting Hsieh; Manuel Quijada; Brent Mott; Eddie Akpan; Gary L. Brown; Mindy B. Jacobson; Matthew A. Greenhouse
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Paper Abstract

A miniature Fabry-Perot tunable infrared filter under development at the NASA Goddard Space Flight Center is fabricated using micro opto electromechanical systems (MOEMS) technology. Intended for wide-field imaging spectroscopy in space flight, it features a large 10-mm diameter aperture structure that consists of a set of opposing suspended thin films 500 nanometers in thickness, supported by annular silicon disks. Achieving the desired effective finesse in the MOEMS instrument requires maximizing the RMS flatness in the film. This paper presents surface characterization data for the suspended aperture film prior to, and following application of a multi-layer dielectric mirror. A maximum RMS flatness of 38 nanometers was measured prior to coating, leading to an estimate of the maximum effective finesse of 14. Results show evidence of initial deformation of the silicon support structure due to internal stress in the substrate and thin film layers. Film stress gradients in the dielectric coating on either side of the aperture add convexity and other localized deflections. The design of a tuning system based upon electrostatic positioning with feedback control is presented.

Paper Details

Date Published: 23 January 2006
PDF: 11 pages
Proc. SPIE 6114, MOEMS Display, Imaging, and Miniaturized Microsystems IV, 61140G (23 January 2006); doi: 10.1117/12.641266
Show Author Affiliations
Jeremy A. Palmer, Sandia National Labs. (United States)
Wen-Ting Hsieh, NASA Goddard Space Flight Ctr. (United States)
Manuel Quijada, NASA Goddard Space Flight Ctr. (United States)
Brent Mott, NASA Goddard Space Flight Ctr. (United States)
Eddie Akpan, NASA Goddard Space Flight Ctr. (United States)
Gary L. Brown, NASA Goddard Space Flight Ctr. (United States)
Mindy B. Jacobson, NASA Goddard Space Flight Ctr. (United States)
Matthew A. Greenhouse, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 6114:
MOEMS Display, Imaging, and Miniaturized Microsystems IV
Hakan Ürey; David L. Dickensheets; Bishnu P. Gogoi, Editor(s)

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