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Updated: Mar 2, 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

Plasmonics Enhanced Smartphone Fluorescence Microscopy.

Qingshan Wei^1,2,3,4, Guillermo Acuna^5,6,7, Seungkyeum Kim⁸

¹Electrical Engineering Department, University of California, Los Angeles, Los Angeles, CA, 90095, USA.

Scientific Reports

|May 20, 2017

Summary

This summary is machine-generated.

This study enhances smartphone fluorescence microscopy sensitivity using surface-enhanced fluorescence (SEF) with a thin metal film. The improved detection limit enables sensitive point-of-care diagnostics, especially in resource-limited settings.

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Area of Science:

Optics and Photonics
Biomedical Engineering
Nanotechnology

Background:

Smartphone fluorescence microscopy is crucial for point-of-care (POC) diagnostics.
Improving detection sensitivity is vital for quantifying low concentrations of target molecules.

Purpose of the Study:

To develop a general strategy for enhancing smartphone-based fluorescence microscopy detection sensitivity.
To utilize surface-enhanced fluorescence (SEF) via a thin metal film for improved sensitivity.

Main Methods:

Implemented a plasmonic design with a silver-coated glass slide and a thin spacer.
Excited samples using backside laser-diode illumination through a glass hemisphere to generate surface plasmon polaritons.
Optimized system parameters including metal-film thickness, spacer distance, excitation angle, and polarization.

Main Results:

Achieved approximately 10-fold enhancement in fluorescence intensity compared to a bare glass substrate.
Successfully imaged single fluorescent particles as small as 50 nm and single quantum dots.
Demonstrated a detection limit of approximately 80 fluorophores per diffraction-limited spot using DNA origami standards.

Conclusions:

The developed mobile SEF system significantly enhances fluorescence detection sensitivity.
This advancement holds promise for sensitive POC diagnostics and sensing in resource-limited environments.
Enables imaging of nanoscale fluorescent materials and quantification of low analyte concentrations.