Smartphone-based multi-contrast microscope using color-multiplexed illumination

Area of Science:

• Biomedical Engineering
• Optical Microscopy
• Mobile Health Technology

Background:

• Traditional microscopy requires bulky equipment.
• Multi-contrast imaging offers richer specimen information.
• Integrating advanced imaging into portable devices is challenging.

Purpose of the Study:

• To develop a portable, multi-contrast microscope using smartphone technology.
• To enable bright-field, dark-field, and differential phase contrast imaging.
• To create a cost-effective and accessible imaging solution.

Main Methods:

• Developed a smartphone add-on module with a patterned color micro-LED array and miniature objective.
• Utilized color-coded light-emitting-diode (LED) microscopy (cLEDscope) for illumination.
• Implemented an Android app for image acquisition, computation, and real-time display.

Main Results:

• Achieved single-shot, multi-contrast imaging (bright-field, dark-field, differential phase contrast).
• Demonstrated the functionality with various thin biological specimens.
• The add-on module is easily attachable to a smartphone.

Conclusions:

• The smartphone-based cLEDscope provides a portable and versatile multi-contrast microscopy solution.
• This technology can enhance point-of-care diagnostics and remote biological analysis.
• The system offers a low-cost alternative to conventional microscopy.