Security tag

Abstract

A security tag 1 includes a plurality of colloidal particles 10 and a resin layer 20. The plurality of colloidal particles 10 are, when in a state of being embedded in the resin layer 20, arranged so as to be spaced apart from each other in a plane direction perpendicular to the thickness direction, and at least one type of two-dimensional crystal R1 composed of the plurality of colloidal particles 10 is present.

Claims

1. Multiple colloidal particles, A resin layer, The multiple colloidal particles are embedded in the resin layer and are arranged apart from each other along a planar direction perpendicular to the thickness direction. There exist multiple types of two-dimensional crystals composed of multiple colloidal particles, A security tag characterized in that multiple types of the aforementioned two-dimensional crystals have different directions for their axes of symmetry along the plane direction.

2. The security tag according to claim 1, wherein the two-dimensional crystal has six-fold symmetry when viewed from the thickness direction.

3. The security tag according to claim 1, wherein the two-dimensional crystal has four-fold symmetry when viewed from the thickness direction.

4. The resin layer has a first surface and a second surface that are opposite to each other in the thickness direction, The security tag according to any one of claims 1 to 3, wherein the colloidal particles are present on the first surface side of the resin layer, of the first and second surfaces.

5. The security tag according to claim 4, further comprising a substrate in contact with the first surface of the resin layer.

6. The security tag according to claim 5, wherein the substrate is in contact with the colloidal particles.

7. The security tag according to claim 5, further comprising an intermediate layer provided between the colloidal particles and the substrate.

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