Supplementary Videos — Annular Optical MEMS Shutter Array (Ring Shutter) with Subfield Addressing for Angle-Tunable Illumination in High-Resolution Coherence Scanning Interferometry
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This repository contains three supplementary videos (SV) that supplement the doctoral thesis listed below. Each video is referenced at a specific place in the thesis via a printed QR code; scanning the code resolves to this repository, where all three files are stored together.
Kaestner_RingShutter_SV1_LayoutGenerationAlgorithm.mp4: Animated visualization of the concentric tessellation algorithm generating the full ring-shutter MEMS layout: radial/azimuthal step sizes are computed and each subring is filled with MEMS shutters at optimized fill factor and homogeneity, built from the inner radius outward. Thesis reference: Section 3.1.2; Figure 3-6 (see also Appendix F, Algorithm F-1).
Kaestner_RingShutter_SV2_3DModelRotation.mp4: Rendered 3D model of the device with resolved MEMS shutter blades in a dynamic oblique view (camera circling the centre), emphasizing radial uniformity and azimuthal isotropy. Shown in an exemplary actuation state with subfield (D,1) closed. Thesis reference: Section 4.1; Figure 4-3 a).
Kaestner_RingShutter_SV3_SubfieldSwitchingDemo.mp4: Experimental demonstration of the fabricated proof-of-concept ring shutter performing dynamic spatial light modulation: robust, fully reversible switching of well-defined annular-sector subfields, captured with the CMOS camera in the optical actuation setup. Three-potential parallel actuation applied: HV ±35 V and GND 0 V, yielding a 70 V differential (+35/−35 V) across the selected subfield while non-selected subfields stay sub-threshold at ≤ 35 V vs. GND. Thesis reference: Section 4.3.2; Figure 4-20 d) (see also Appendix B).
Related thesis: P. Kästner, "Development and Characterization of an Annular Optical MEMS Shutter Array with Subfield Addressing for Angle-Tunable Illumination in High-Resolution Coherence Scanning Interferometry," Ph.D. dissertation, Fac. Elect. Eng. Comput. Sci. (FB 16), Univ. Kassel, Kassel, Germany, 2026. (submitted)
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