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Article Dans Une Revue Micromachines Année : 2023

Biaxial piezoelectric MEMS mirrors with low absorption coating for 1550 nm long-range LIDAR

Résumé

This paper presents the fabrication and characterization of a biaxial MEMS (MicroElectroMe-chanical System) scanner based on PZT (Lead Zirconate Titanate), which incorporates a low-absorption dielectric multilayer coating, i.e. a Bragg reflector. These 2 mm square MEMS-mirrors, developed on 8-inch silicon wafers using VLSI (Very Large Scale Integration) technology are intended for long range (>100 m) LIDAR (LIght Detection And Ranging) applica-tions using a 2W (average power) pulsed laser at 1550 nm. For this laser power, the use of a standard metal reflector leads to damaging overheating. To solve this problem, we have devel-oped and optimised a physical sputtering (PVD) Bragg reflector deposition process compatible with our sol-gel piezoelectric motor. Experimental absorption measurements, performed at 1550 nm, show up to 24 times lower incident power absorption than the best metallic reflective coat-ing (Au). Furthermore, we validated that the characteristics of the PZT, as well as the perfor-mance of the Bragg mirrors in terms of optical scanning angles, were identical to those of the Au reflector. These results open up the possibility of increasing the laser power beyond 2W for LI-DAR applications, or other applications requiring high optical power. Finally, a packaged 2D scanner was integrated into a LIDAR system and three-dimensional point cloud images were obtained, demonstrating the scanning stability and operability of these 2D MEMS-mirrors.
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Dates et versions

cea-04552097 , version 1 (19-04-2024)

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Laurent Mollard, Jordi Riu, Santiago Royo, Christel Dieppedale, Antoine Hamelin, et al.. Biaxial piezoelectric MEMS mirrors with low absorption coating for 1550 nm long-range LIDAR. Micromachines, 2023, 14 (5), pp.1019. ⟨10.3390/mi14051019⟩. ⟨cea-04552097⟩
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