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The relentless pursuit of enhanced holographic capacity—critical for addressing the surging demand for high-density information storage and high-fidelity optical displays—continuously spurs the advancement of multi-dimensional multiplexed holography. Herein, we present a four-dimensional holographic multiplexing strategy that synergistically integrates the radial and azimuthal indices of Laguerre–Gaussian (LG) modes, the rotation state of diffractive neural network layers, and the input polarization. 16 LG modes undergo independent unitary transformations via a three-layer diffractive architecture, while establishing one-to-many hologram mapping across three distinct rotational configurations of the layers. By physically implementing this architecture using cascaded metasurfaces, a pair of helicity-orthogonal channels are incorporated to afford polarization-multiplexed operations. Accordingly, a 96-channel holographic system is constructed with a three-layer rotatable meta-platform, successfully demonstrating high-fidelity hologram generation. This work merges optical and non-optical multiplexing parameters to efficiently expand holographic channel capacity, anticipated to expedite the deployment of advanced high-dimensional optical signal processing and displays.
Zeng et al. (Tue,) studied this question.