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IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...

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Meta-hologram-based authentication scheme employing a speckle pattern fingerprint.

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This study introduces a novel optical holographic security tag that projects a Quick Response (QR) code and a unique "fingerprint" when illuminated. The tag is unclonable without a secret key, offering robust anti-counterfeiting capabilities.

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Area of Science:

Optics and Photonics
Information Security
Materials Science

Background:

Traditional security tags face challenges with counterfeiting and cloning.
Holographic techniques offer potential for advanced security features.
The need for robust, unclonable identification methods is growing.

Purpose of the Study:

To propose and demonstrate a novel optical holographic security tag.
To develop a tag that is unclonable without a secret key.
To experimentally validate the tag's anti-counterfeiting properties and robustness.

Main Methods:

Concept development of an optical holographic security tag.
Implementation using plasmonic meta-holograms.
Numerical simulations and experimental characterization of tag performance.

Main Results:

The tag successfully projects a Quick Response (QR) code and a unique speckle pattern fingerprint upon laser illumination.
Numerical analysis confirmed the tag's unclonability without a secret design key.
Experimental realization and testing demonstrated robustness to fabrication errors and resilience to counterfeiting.

Conclusions:

The proposed optical holographic security tag offers a secure and robust solution for anti-counterfeiting.
The combination of QR code projection and a unique speckle fingerprint enhances security.
The technology shows promise for practical implementation in various security applications.