Holographic Imaging Based on Dielectric Metasurface Polarisation Multiplexing

本文设计了一种矩形硅柱的单元结构，该结构在1550 nm波长下可以通过几何相位和传输相位同时调控达到偏振复用效果。1550 nm波长位于人眼不可见的红外区域，不仅具备较强的抗干扰能力和光学材料兼容性，在安全需求、设备部署和部件制造等方面也表现出较高的适用性。据此选取波长1550 nm进行模拟，在右旋圆偏振光和左旋圆偏振光的照射下，均能观测到清晰的全息图，其峰值信噪比分别为10.86 dB和11.03 dB，结构相似性分别为0.673和0.702。该介质超表面具有微弱串扰、结构简单等优点，采用双通道独立设计，在许多领域表现出更大的应用潜力，如信息编码或存储，防伪，信息复用等。A rectangular silicon pillar element structure is designed in this paper, and the dielectric metasurface can be operated by both the transmission and geometric phases at the same time in order to achieve a polarisation multiplexing effect at a wavelength of 1550 nm. The 1550 nm wavelength features an infrared area that is not visible to the human eye; it also has strong anti-interference ability and optical material compatibility; additionally, it has good application in terms of safety requirements, equipment deployment, and component manufacturing. Based on this, the wavelength of 1550 nm was selected for simulation, and a clear hologram could be observed under the irradiation of right-handed circularly polarised light and left-handed circularly polarised light, with peak signal-to-noise ratios of 10.86 dB and 11.03 dB, and structural similarity of 0.673 and 0.702, respectively. The media metasurface features a dual-channel independent design that offers benefits such as minimal crosstalk and a straightforward structure, demonstrating significant potential for applications in areas like information coding and storage, anti-counterfeiting, and information reuse.