Characterization of a Single-Capture Bright-Field and Off-Axis Digital Holographic Microscope for Biological...

Area of Science:

• Biomedical Optics
• Microscopy
• Cell Biology

Background:

• Analyzing large, confluent biological samples like cell layers or tissue sections presents imaging challenges.
• Existing multimodal imaging techniques often suffer from synchronization issues and slow acquisition speeds.

Purpose of the Study:

• To develop a single-capture multimodal imaging approach integrating bright-field (BF) microscopy and quantitative phase imaging (QPI).
• To enable rapid and versatile analysis of extended biological specimens.

Main Methods:

• Integration of a fiber-optic Mach-Zehnder interferometer-based off-axis digital holographic microscopy (DHM) with a commercial BF microscope.
• Simultaneous capture of BF images and digital holograms using 8-bit grayscale dynamic range multiplexing.
• Numerical demultiplexing via Fourier filtering, phase aberration compensation, and weighted image subtraction.

Main Results:

• The developed system successfully captures both BF and QPI data in a single acquisition.
• Numerical processing effectively separates and reconstructs multimodal images.
• The system demonstrates improved acquisition speed and versatility compared to previous BF-DHM methods.
• Successful multimodal imaging of living cells was achieved, showcasing application potential.

Conclusions:

• The single-capture BF-DHM approach offers a significant advancement for fast, multimodal imaging of large biological samples.
• This technique overcomes limitations of previous methods, enabling efficient analysis of confluent cell layers and tissue sections.
• The system holds strong potential for accelerating biomedical research and diagnostics.