Huo Dewang, Li Guoqiang
Intelligent Optical Imaging and Sensing Group, Institute of Optoelectronics, State Key Laboratory of Photovoltaic Science and Technology, Shanghai Frontier Base of Intelligent Optoelectronics and Perception, Fudan University, Shanghai 200438, China.
Zhejiang Laboratory, Hangzhou 311100, China.
Nanomaterials (Basel). 2024 Jul 7;14(13):1160. doi: 10.3390/nano14131160.
Dynamic optical structural color is always desired in various display applications and usually involves active materials. Full-color generation, especially bi-directional full-color generation in both reflective and transmissive modes, without any active materials included, has rarely been investigated. Herein, we demonstrate a scheme of bi-directional full-color generation based on a plasmonic metasurface modulated by the rotation of the polarization angle of the incident light without varying the geometry and the optical properties of the materials and the environment where the metasurface resides. The metasurface unit cell consists of plasmonic modules aligning in three directions and is patterned in a square array. The metasurface structural color device is numerically confirmed to generate full colors in both reflection and transmission. Based on the proposed polarization-dependent structural color, the information encoding process is demonstrated for three multiplexed animal images and quick-responsive (QR) codes to verify the efficient information encoding and decoding of the proposed scheme. In the simulation, the animals can be seen under different polarization incidences, and the QR codes can be successfully decoded by the polarization rotation in transmission. The proposed bi-directional full-color generation metasurface has great potential in applications such as kaleidoscope generation, anti-counterfeiting, dynamic color display, and optical information encoding.
动态光学结构色在各种显示应用中一直备受青睐，通常涉及活性材料。在不包含任何活性材料的情况下实现全色生成，尤其是在反射和透射模式下的双向全色生成，很少有人进行研究。在此，我们展示了一种基于表面等离激元超表面的双向全色生成方案，该超表面通过入射光偏振角的旋转进行调制，而不改变超表面所在材料和环境的几何形状及光学特性。超表面单元由沿三个方向排列的表面等离激元模块组成，并以正方形阵列进行图案化。数值计算证实，超表面结构色器件在反射和透射中均能产生全色。基于所提出的偏振相关结构色，对三个复用动物图像和二维码进行了信息编码过程演示，以验证所提方案的高效信息编码和解码。在模拟中，在不同偏振入射下可以看到动物，并且二维码可以通过透射中的偏振旋转成功解码。所提出的双向全色生成超表面在万花筒生成、防伪、动态色彩显示和光学信息编码等应用中具有巨大潜力。
