Wavelength-multiplexed orbital angular momentum meta-holography

In our study, we introduce wavelength-multiplexed orbital angular momentum meta-holography, aiming to expand holographic information channels by leveraging light's wavelength and orbital angular momentum (OAM). We selectively employed red, green, and blue as primary colors, and incorporated four unique OAM channels (-2, -1, 1, and 2). Through the utilization of a metasurface comprising three distinct types of wavelength-selective meta-atoms, we successfully encoded the twelve holographic images onto a single metasurface. This advancement holds significant potential for applications in various fields, providing opportunities for advanced holography and augmented reality systems.