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Suppressing meta-holographic artifacts by laser coherence tuning

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posted on 2023-11-30, 21:08 authored by Yaniv Eliezer, Geyang Qu, Wenhong Yang, Yujie Wang, Hasan Yilmaz, Shumin Xiao, Qinghai Song, Hui Cao
A metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact size. However, it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale features. Here, we introduce an efficient method to remove all artifacts by fine-tuning the spatial coherence of illumination. Our method is implemented with a degenerate cavity laser, which allows precise, continuous tuning of spatial coherence over a wide range with little variation in emission spectrum and total power. We find the optimal degree of spatial coherence to remove the coherent artifacts of a meta-hologram while maintaining the image sharpness. This work paves the way to compact and dynamical holographic display free of coherent defects.

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