A 2D MEMS mirror with sidewall electrodes applied for confocal MACROscope imaging.

Area of Science:

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

Background:

• Confocal laser scanning microscopy is crucial for high-resolution biomedical imaging.
• Traditional microscopes utilize galvo-scanners and XYZ-stages, which can limit field of view and complexity.
• There is a need for improved designs offering larger fields of view and enhanced imaging capabilities.

Purpose of the Study:

• To present a novel confocal MACROscope design utilizing microelectromechanical system (MEMS) micromirrors with sidewall electrodes.
• To replace conventional galvo-scanners and XYZ-stages with MEMS micromirrors for improved performance.
• To optimize the optical design and evaluate the performance of the MEMS micromirror-based system for biomedical imaging.

Main Methods:

• Developed and tested two micromirror-based optical configurations for the confocal MACROscope.
• Optimized scanning angle, field of view, and numerical aperture.
• Investigated scanning frequency and control waveforms for the micromirror.
• Integrated the micromirror into the MACROscope and performed tests at 40 Hz with open-loop control.

Main Results:

• Achieved repeatable scanning at 40 Hz using open-loop control, enabling synchronization with XYZ-stage and image acquisition.
• Successfully built and tested a laser scanning microscope system using a MEMS micromirror with 2 μm width torsion bars.
• Obtained a 2D image, demonstrating the feasibility of the micromirror-based confocal MACROscope.

Conclusions:

• MEMS micromirrors with sidewall electrodes offer a viable alternative to traditional scanners in confocal microscopy.
• The developed micromirror-based confocal MACROscope design shows promise for practical biomedical imaging applications.
• This work provides an experimental foundation for future development of advanced, large-field-of-view confocal MACROscopes.