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Updated: May 9, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Edible optical microcavities for optical barcoding, authentication, and sensing.

Abdur Rehman Anwar^1,2, Slavko Kralj¹, Matjaž Humar^3,4,5

¹J. Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia.

Scientific Reports

|May 7, 2026

Summary

This summary is machine-generated.

Researchers developed edible optical microcavities using chlorophyll-coated microspheres for secure product authentication. These microcavities act as unique optical barcodes, enhancing food and pharmaceutical safety and traceability.

Keywords:

Edible materials Optical barcodes Physical unclonable functions Sensors Whispering gallery modes

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Last Updated: May 9, 2026

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Area of Science:

Materials Science
Optical Engineering
Food Science

Background:

Food and pharmaceutical safety face challenges from counterfeiting, with external anti-counterfeiting measures being vulnerable.
Incorporating security features directly into edible products offers a more robust solution.

Purpose of the Study:

To develop edible whispering-gallery mode (WGM) microcavities for secure labeling and sensing in consumable products.
To demonstrate the potential of these microcavities as edible optical barcodes and physical unclonable functions (PUFs).

Main Methods:

Fabrication of chlorophyll-coated silica microspheres supporting stable WGM resonances.
Embedding microspheres in agarose matrices to create size-specific spectral signatures.
Utilizing size variations for edible physical unclonable functions (PUFs).
Integrating microcavities into pH-responsive hydrogels for sensing applications.

Main Results:

Stable WGM resonances with quality factors of 2,000–10,000 were achieved.
Microsphere diameters were determined with ~40 nm precision.
Edible optical barcodes with stability exceeding six months were demonstrated.
Sugar concentration and pH sensing capabilities were shown with high accuracy.

Conclusions:

Edible WGM microcavities offer a multifunctional platform for secure labeling and anti-counterfeiting.
This technology enhances the safety, authenticity, and traceability of food and pharmaceutical products.
The developed microcavities enable sensitive environmental monitoring within consumable goods.