Biaxial Piezoelectric MEMS Mirrors with Low Absorption Coating for 1550 nm Long-Range LIDAR
| Autor: | L. Mollard, J. Riu, S. Royo, C. Dieppedale, A. Hamelin, A. Koumela, T. Verdot, L. Frey, G. Le Rhun, G. Castellan, C. Licitra |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria, Universitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica |
| Rok vydání: | 2023 |
| Předmět: |
Bragg reflector
Quasi-static actuator Mechanical Engineering Bragg gratings Piezoelectricity quasi-static actuator 2D MEMS mirror piezoelectric high power management High power management Bragg Xarxes de Enginyeria electrònica::Microelectrònica [Àrees temàtiques de la UPC] Electromechanical devices Control and Systems Engineering Dispositius electromecànics Piezoelectric Electrical and Electronic Engineering Piezoelectricitat |
| Zdroj: | Micromachines; Volume 14; Issue 5; Pages: 1019 |
| ISSN: | 2072-666X |
| DOI: | 10.3390/mi14051019 |
| Popis: | This paper presents the fabrication and characterization of a biaxial MEMS (MicroElectroMechanical 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) applications using a 2 W (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 developed and optimised a physical sputtering (PVD) Bragg reflector deposition process compatible with our sol-gel piezoelectric motor. Experimental absorption measurements, performed at 1550 nm and show up to 24 times lower incident power absorption than the best metallic reflective coating (Au). Furthermore, we validated that the characteristics of the PZT, as well as the performance 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 LIDAR 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. This research was funded by ECSEL Joint Undertaking (JU) grant number No. 826600 (project VIZTA). |
| Databáze: | OpenAIRE |
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