Fig. 10: Thermal reconfiguration of C12 tag and assessment of the respective PUF performance. | Communications Materials

Fig. 10: Thermal reconfiguration of C12 tag and assessment of the respective PUF performance.

From: Random and unpredictable optical textures in biobased self-assembled ionogels for dynamic anti-counterfeiting tags

Fig. 10

a POM images showing the irreversible effect of subjecting a C12 film to a thermal treatment consisting of heating and cooling down to obtain reconfigured tags with the droplets in axial configuration. The scalebar represents 50 µm. c Inter-tag similarity matrix was calculated for POM images of 8 thermally treated C12 tags from the same batch of production. Each matrix element represents the similarity (FSIM index) between 2 POM images. The diagonal elements represent the FSIM index for the same tag images, and the non-diagonal elements represent the FSIM index for pairs of different tags. d Intra-tag similarity matrix, representing the FSIM indexes for pairs of POM images of the same C12 tag taken in different conditions (different days, illumination, focus, contrast, translation and rotation). e Distribution histograms of the inter-tag and intra-tag FSIM values from (b, c), superimposed with Gaussian distributions with mean and standard deviation equal to those of the inter- and intra-tag FSIM values.

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