Modularized microscope based on parallel phase-shifting digital holography for imaging of living biospecimens

Area of Science:

• Optical microscopy
• Holography
• Biophysics

Background:

• Traditional parallel phase-shifting digital holographic microscopes (PPSDHM) are often fixed, limiting their application for dynamic specimens.
• Existing PPSDHM designs present challenges in sample manipulation and require relocation for different experimental setups.

Purpose of the Study:

• To develop a modularized PPSDHM for versatile three-dimensional (3D) measurements of dynamic specimens.
• To enhance the adaptability and ease of use of PPSDHM technology.

Main Methods:

• Designed an inverted PPSDHM integrating optical elements onto an optical breadboard for modularity.
• Recorded high-speed 3D motion pictures of transparent specimens, specifically Volvoxes, at 1000 frames per second.
• Implemented 3D tracking algorithms to analyze the movement of individual Volvoxes.

Main Results:

• Successfully reconstructed 3D images from single-shot exposure holograms.
• Demonstrated the capability to capture 3D motion-pictures of dynamic biological samples.
• Obtained precise 3D trajectories of Volvoxes, showcasing the system's tracking accuracy.

Conclusions:

• A modularized PPSDHM was successfully constructed and validated.
• The developed PPSDHM system effectively performs 3D image acquisition and motion analysis of dynamic specimens.
• This modular design enhances the practical application of PPSDHM in various research scenarios.