Security identification

One of the salient properties of photonic crystals is that the photonic bandgap changes with the incident angle, resulting in changes in the viewing angle, the material appears color also rainbow-like changes. Photonic crystal color dependence on the angle, this inherent characteristics make it possible to become a new type of security materials.       Further, by adjusting the color of the printing medium, the spectral curve coincides with the reflection spectrum curve at the time of normal incidence of the printed pattern of the photonic crystal material, so that the color difference caused by the angle of the photonic crystal ink on the printed pattern is Does not affect the observation of the printed pattern under the premise of the copy of the paper will no longer show the printing pattern, in order to achieve complete anti-copy purpose. At the same time photon crystal material as a security spot pigment, easy to combine the commonly used solvent-based or water-based media, so that anti-counterfeit ink showed a strong stability, and easy to operate, will not bring environmental pollution. Photon crystal as a security material is still in the product development stage, but the market development potential is great, the development space is also very broad.