Integrated monolithic 3D MEMS scanner for switchable real time vertical/horizontal cross-sectional imaging.

Area of Science:

• Microelectromechanical Systems (MEMS)
• Optical Engineering
• Biomedical Imaging

Background:

• Traditional imaging techniques face limitations in resolution and field-of-view for in-situ tissue analysis.
• Miniaturized scanning devices are crucial for developing advanced endoscopic imaging systems.

Purpose of the Study:

• To develop and characterize an integrated monolithic, electrostatic 3D MEMS scanner.
• To evaluate its performance for seamless cross-sectional tissue imaging.

Main Methods:

• Fabrication of a compact 3.2 × 2.9 mm(2) electrostatic 3D MEMS scanner.
• Utilizing parametric excitation near resonance frequencies for large optical deflections.
• Integration into a dual-axis confocal endomicroscope system.

Main Results:

• Achieved large optical deflection angles of ± 27° (X-axis) and ± 28.5° (Y-axis).
• Obtained significant Z-axis displacement up to 510 μm with low drive voltages.
• Demonstrated seamless horizontal and vertical cross-sectional imaging in tissue with a wide field-of-view (>1 × 1 mm(2)) at 5 frames/sec.

Conclusions:

• The developed 3D MEMS scanner offers a compact and efficient solution for high-resolution, wide-field-of-view endoscopic imaging.
• Parametric excitation is an effective method for achieving large deflections in MEMS scanners.
• The system shows promise for real-time in-vivo tissue diagnostics.