A collaborative research team from the Hong Kong University of Science and Technology, Fudan University, and the University of Hong Kong has developed a novel vector holographic technology that uses ultrathin metasurfaces to generate holographic images simultaneously encoding intensity and polarization information. This advancement opens new pathways for the application of holography in integrated optical systems.
Traditional holographic systems rely on complex optical interference setups, while computational methods such as the Gerchberg-Saxton algorithm simplify the design process but can only produce scalar holograms with uniform polarization. The new vector holographic technology achieves precise control over phase and polarization conversion through meta-atom designs based on metal-insulator-metal structures. The metasurface device has a thickness of only one-quarter of the operating wavelength, with a sample size smaller than 200×200μm², offering excellent integration compatibility.
The research team combined the GS algorithm with wave decomposition techniques to calculate the required scattering properties for each meta-atom. By adjusting geometric parameters and rotation angles, they utilized structural resonances and Pancharatnam-Berry phase to regulate the reflection phase and polarization state. In experiments conducted at the 1064nm near-infrared wavelength, the researchers successfully fabricated vector holograms featuring complex patterns such as clocks, flowers, and flying birds.
Experimental results show that these holographic images exhibit distinct polarization states in different regions, producing dynamic variation effects when observed through a rotating polarizer. This characteristic offers new possibilities for applications in optical encryption and anti-counterfeiting. One of the devices achieved a conversion efficiency of nearly 68%, surpassing previous vector holographic systems.
This research establishes a multifunctional platform for efficient, polarization-independent vector holography. The ultrathin design and compatibility with on-chip photonics demonstrate application potential in secure data storage, anti-counterfeiting technologies, and integrated optical systems. The method is also applicable to other wavelength ranges and transmission modes, and future use of dielectric materials is expected to further enhance performance.
