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Updated: Aug 26, 2025
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
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Using intrinsic properties of quantum dots to provide additional security when uniquely identifying devices.
Matthew J Fong1, Christopher S Woodhead2, Nema M Abdelazim2,3
1Physics Department, Lancaster University, Bailrigg, LA1 4YB, UK. j.fong@lancaster.ac.uk.
Scientific Reports
|October 8, 2022
Summary
This study introduces a novel anti-counterfeiting method using quantum dot physical unclonable functions (PUFs). By measuring photoluminescence under varying excitation power, these PUF tags offer a secure, non-clonable fingerprint readable with a smartphone.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Unique identification is crucial for anti-counterfeiting optical devices.
- Existing optical solutions like holograms have limitations in fabrication and reproduction complexity.
- Physical unclonable functions (PUFs) offer inherent asymmetry but can be vulnerable to replication.
Purpose of the Study:
- To enhance the security of nanoparticle-based PUFs against cloning and simulation.
- To introduce a novel authentication method using a second measurement parameter for PUFs.
- To develop a facile and secure optical authentication system using quantum dots.
Main Methods:
- A modified nanoparticle PUF model utilizing quantum dots encapsulated in a transparent polymer tag.
- Measurement of photoluminescence as a function of excitation power to capture a unique fingerprint.
- Utilizing an unmodified smartphone with its built-in flash for tag excitation and reading.
Main Results:
- Demonstrated a unique, non-trivial fingerprint based on the nonlinear photoluminescence response of quantum dots.
- Confirmed that the developed PUF tags are difficult to clone or simulate.
- Successfully read the quantum dot PUF tags using a standard smartphone, showcasing practical applicability.
Conclusions:
- The modified quantum dot PUF system provides enhanced security for optical device authentication.
- This approach offers a more secure and facile alternative to existing optical anti-counterfeiting methods.
- The use of smartphones for reading PUF tags eliminates the need for complex characterization techniques.
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