Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 10, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s41377-021-00547-0
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Funding
- US Office of Naval Research (ONR) [N00014-221-1-2026]
- National Key Research and Development Program of China [2018YFB2200403]
- National Natural Science Foundation of China [12025402, 11974092, 91850204, 11934012, 61975041]
- Shenzhen Fundamental research projects [JCYJ20180507184613841, JCYJ20180507183532343, JCYJ20180306172041577]
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This research presents an efficient method to suppress coherent artifacts in metasurface holograms by fine-tuning the spatial coherence of illumination. By utilizing a degenerate cavity laser, it allows precise and continuous tuning of spatial coherence, leading to the suppression of coherent artifacts while maintaining image sharpness.
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 suppress all artifacts by fine-tuning the spatial coherence of illumination. Our method is implemented with a degenerate cavity laser, which allows a precise and continuous tuning of the spatial coherence over a wide range, with little variation in the emission spectrum and total power. We find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image sharpness. This work paves the way to compact and dynamical holographic displays free of coherent defects.
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