MEMS Mirror Technologies for Scanning Applications
Summary
Microelectromechanical systems (MEMS) mirrors have revolutionised beam steering and image acquisition across fields from lidar sensing and biomedical imaging to optical displays. By integrating miniature mirrors with electrostatic, electrothermal, electromagnetic or piezoelectric actuators, these devices achieve precise two-axis deflection with minimal power consumption and compact footprints. Recent advances have enhanced scan angles, resonant frequencies and mechanical robustness, enabling rapid frame rates and wide fields of view in portable and endoscopic systems. Innovations in materials, such as polymer-based isolation layers, and architectures, including bimorph actuators and gimballed designs, have improved durability under shock and vibration. Simultaneously, developments in scanning trajectories—ranging from raster and Lissajous patterns to spiral resonant schemes—address the trade-off between temporal resolution and spatial coverage. Collectively, these refinements underpin the deployment of MEMS mirrors in autonomous vehicles, wearable diagnostics, optical coherence tomography and miniaturised microscopy, underscoring their global technological importance.
Research from Nature Portfolio
Recent studies have elucidated design principles for high-definition, high-frame-rate two-axis Lissajous scanning. The work establishes a frequency selection rule that optimises both fill factor and repeated pattern rate by choosing scanning frequencies that maximise their greatest common divisor while satisfying a target lobe count. Experimental validation demonstrated substantial improvements in image uniformity and temporal throughput by fine-tuning resonant actuation within the bandwidth of compact Lissajous scanners. These insights provide a concrete framework for engineering MEMS mirror trajectories in applications demanding high spatial fidelity and rapid refresh rates.
Research from all publishers
Recent research in non-portfolio journals has introduced robust electrothermal micromirrors utilising photosensitive polyimide to replace brittle silicon dioxide isolation layers. These devices achieve optical scan angles of up to ±19.6° and vertical displacements of several hundred micrometres at low drive voltages, while surviving high-g shock and drop impacts, marking a fourfold improvement in mechanical resilience. Another study presents a double-spiral resonant scanning mechanism that balances field of view and frame rate for miniaturised optical microscopes. Demonstrated in photoacoustic endoscopy, this approach enhances imaging speed by over 60% and doubles the scan area without compromising signal fidelity. Foundational reviews on MEMS mirrors for lidar systems introduce a figure of merit combining aperture, field of view and resonant frequency to compare actuation schemes, guiding the design of cost-effective scanning solutions for autonomous sensing platforms.
MEMS Mirror Technologies for Scanning Applications publication trend
The graph below shows the total number of articles in mems mirror technologies for scanning applications across all publications each year (not limited to Nature Index journals).
Technical terms
MEMS: Miniaturised mechanical and electro-mechanical elements manufactured using microfabrication techniques.
Resonant frequency: The natural vibration rate at which a MEMS mirror oscillates with maximal amplitude for minimal input energy.
Lissajous scanning: A two-axis scanning trajectory generated by driving orthogonal axes at different resonant frequencies.
Field of view (FoV): The angular extent of the observable scene that a scanning mirror can cover.
Fill factor: The proportion of scan area that is uniformly illuminated or imaged during a scanning cycle.
References
- Frequency selection rule for high definition and high frame rate Lissajous scanning. Scientific Reports (2017).
- Double spiral resonant MEMS scanning for ultra-high-speed miniaturized optical microscopy. Optica (2023).
- MEMS Mirrors for LiDAR: A Review. Micromachines (2020).
- A robust lateral shift free (LSF) electrothermal micromirror with flexible multimorph beams. Microsystems & Nanoengineering (2023).
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