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Updated: May 7, 2026

Wide-field Fluorescent Microscopy and Fluorescent Imaging Flow Cytometry on a Cell-phone

Wide-field Fluorescent Microscopy and Fluorescent Imaging Flow Cytometry on a Cell-phone

Published on: April 11, 2013

Capillary Array Waveguide Amplified Fluorescence Detector for mHealth.

Joshua Balsam¹, Hugh Alan Bruck, Avraham Rasooly

¹Division of Biology, Office of Science and Engineering, FDA, Silver Spring, MD 20993 ; University of Maryland, College Park, MD 20742.

Sensors and Actuators. B, Chemical

|September 17, 2013

Summary

This summary is machine-generated.

This study developed a capillary tube array to amplify fluorescence signals for mobile health diagnostics. The new device significantly improves cell phone camera sensitivity, making mHealth practical for resource-poor settings.

Keywords:

CMOS fluorescence microfabrication microfluidics mobile phone smartphone

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Last Updated: May 7, 2026

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Published on: April 11, 2013

Visual Detection of Multiple Nucleic Acids in a Capillary Array

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Multiplexed Fluorescent Microarray for Human Salivary Protein Analysis Using Polymer Microspheres and Fiber-optic Bundles

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Published on: October 10, 2013

Area of Science:

Biomedical Engineering
Optical Sensing
Mobile Health Diagnostics

Background:

Mobile Health (mHealth) technologies offer potential for medical diagnostics in resource-limited areas.
Current mHealth biodetection using cell phone cameras lacks sensitivity for weak fluorescent signals.
Simple, low-cost, portable devices are crucial for underserved populations.

Purpose of the Study:

To enhance the sensitivity of mobile phone-based biodetection systems.
To develop a novel optical configuration for amplifying weak fluorescence signals.
To enable sensitive mHealth diagnostics in resource-poor settings.

Main Methods:

A capillary tube array was designed to amplify fluorescence signals via waveguide properties.
A 36-capillary tube array demonstrated a ~100X increase in sensitivity.
Silver coating experiments confirmed waveguide behavior as the amplification mechanism.

Main Results:

The limit of detection (LOD) for fluorescein was reduced from 1000 nM to 10 nM.
A novel 3D illumination system enabled 2D array illumination, enhancing multiplexing capabilities.
The capillary array approach proved effective in amplifying weak fluorescent signals.

Conclusions:

The capillary tube array significantly improves the sensitivity of mobile phone optical detectors.
This technology can facilitate sensitive biological assays using low-sensitivity detectors.
The developed mHealth approach holds promise for practical diagnostics in global health settings.