Fabrication of Dynamic Holograms on Polymer Surface by Direct Laser Writing for High-Security Anti-copyright Applications

Fabrication of Dynamic Holograms on Polymer Surface by Direct Laser Writing for High-Security Anti-copyright Applications

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Anti-copyright technology has attracted much attention with the development of economy, because many copyright products that are difficult for identification have been produced, which extremely damage the interests of consumers.Here, a high-resolution ultraviolet direct laser writer is applied to fabricate computer-generated holograms (CGH) with laser spot size of 300 halloween cookie card nm for anti-copyright applications.The characteristics of the reconstructed images illuminated by monochromatic light are demonstrated in details.Additionally, colorful reconstructed images are observed with white light illumination in the high-security holograms samples.

Furthermore, a kinematic honeywell df300 n95 effect of colorful reconstructed images are also observed by modifying focus depth and object size in the algorithm.The normal first (+1st) order diffraction and negative first (-1st) order diffraction in the high-security holograms exhibit different sizes due to distinguishing magnifications.The kinematic effect of white-light holograms shows great potential in anti-copyright applications due to its simplicity for recognition and high security since they are hard to duplicate.