27 February 2015 Spatially resolved contrast measurement of diffractive micromirror arrays
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Proceedings Volume 9375, MOEMS and Miniaturized Systems XIV; 93750D (2015) https://doi.org/10.1117/12.2076921
Event: SPIE OPTO, 2015, San Francisco, California, United States
Abstract
Diffractive micromirror arrays (MMA) are a special class of optical MEMS, serving as spatial light modulators (SLM) that control the phase of reflected light. Since the surface profile is the determining factor for an accurate phase modulation, high-precision topographic characterization techniques are essential to reach highest optical performance. While optical profiling techniques such as white-light interferometry are still considered to be most suitable to this task, the practical limits of interferometric techniques start to become apparent with the current state of optical MEMS technology. Light scatter from structured surfaces carries information about their topography, making scatter techniques a promising alternative. Therefore, a spatially resolved scatter measurement technique, which takes advantage of the MMA’s diffractive principle, has been implemented experimentally. Spectral measurements show very high contrast ratios (up to 10 000 in selected samples), which are consistent with calculations from micromirror roughness parameters obtained by white-light interferometry, and demonstrate a high sensitivity to changes in the surface topography. The technique thus seems promising for the fast and highly sensitive characterization of diffractive MMAs.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Cornelius Sicker, Cornelius Sicker, Jörg Heber, Jörg Heber, Dirk Berndt, Dirk Berndt, Florian Rückerl, Florian Rückerl, Jean-Yves Tinevez, Jean-Yves Tinevez, Spencer Shorte, Spencer Shorte, Michael Wagner, Michael Wagner, Harald Schenk, Harald Schenk, } "Spatially resolved contrast measurement of diffractive micromirror arrays", Proc. SPIE 9375, MOEMS and Miniaturized Systems XIV, 93750D (27 February 2015); doi: 10.1117/12.2076921; https://doi.org/10.1117/12.2076921
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