Composite multi-dimensional polarization dependent anti-counterfeiting device based on LCP/TLC

The development of modern anti-counterfeiting technology can effectively suppress and combat forgery counterfeiting, which is great significance in the fields information security, national defense economy. However, realization multi-dimensional, integrated, difficult-to-copy easy-to-detect optical devices remains a challenge. In this paper, multi-dimensional polarization-dependent device with structure color designed, composed patterned liquid crystal polymer (LCP) nematic layer thermotropic cholesteric (TLC) layer. It has advantages displaying hiding polarization states, wide tuning range, convenient operation, high integration security. For incident light specific state, phase LCP carry out regionalized editing state modulation, while TLC selectively reflect light. Therefore, structural security label subtly realized. realize display, hiding, adjustment image/background conversion patterns by adjusting direction addition, meet application requirements anti-counterfeit at different environmental temperatures through flexible design system weight ratio. Furthermore, be easily heated body temperature, dynamic real-time wide-spectrum modulation reversible pattern erasure, further enhance its dimension multi-polarization type total three dimensions principle. first effect achieved thermochromic no reflection outside operating temperature range material, entire displays black background. second third are related to linear direction, respectively. Only when linearly polarized makes an angle 45° or -45° respect axis crystal, will show designed pattern. Consequently, our proposed expected provide new idea for field.