| 초록 |
Here, we create a dynamic optical system that reversibly displays three modes of holograms in a single architecture through a solvent exchange. We used dithering mask lithography to pattern conjugated polydiacetylene (PDA) organogels with varying crosslinking density in two dimensions, forming 2D periodic refractive index variations that displayed structural color via diffraction. When immersed in protic solvents, the PDA organogels shrank anisotropically and it caused the 2D optical periodicity of the organogels to vary along the thickness direction, resulting in the disappearance of structural colors and the appearance of unusual 3D full parallax holographic signals. Unlike typical optical systems displaying a single-mode hologram, our system realizes multi-modal holograms in a cost-effective and scalable manner. Such a robust system will find ample applications in multi-level anti-counterfeiting and encryption technologies. |
