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Suppressing meta-holographic artifacts by laser coherence tuning
Yaniv Eliezer1, Geyang Qu2, Wenhong Yang2
1Department of Applied Physics, Yale University, New Haven, CT, 06520, USA.
Light, Science & Applications
|May 20, 2021
Summary
We developed a method to eliminate artifacts in meta-holograms by adjusting illumination spatial coherence. This technique enables sharper holographic images, paving the way for defect-free dynamic holographic displays.
Area of Science:
- Optics and Photonics
- Metamaterials
- Holography
Background:
- Metasurface holograms offer high resolution and wide viewing angles in a compact form factor.
- Coherent artifacts, caused by electromagnetic crosstalk and fabrication defects, degrade metasurface hologram performance.
Purpose of the Study:
- To introduce an efficient method for suppressing coherent artifacts in metasurface holograms.
- To demonstrate the use of tunable spatial coherence for artifact mitigation.
Main Methods:
- Implementing a degenerate cavity laser for precise, continuous tuning of illumination spatial coherence.
- Optimizing the degree of spatial coherence to balance artifact suppression and image sharpness.
Main Results:
- Successfully suppressed coherent artifacts in metasurface holograms.
- Maintained image sharpness by finding the optimal spatial coherence level.
- Demonstrated minimal variation in emission spectrum and total power during coherence tuning.
Conclusions:
- Fine-tuning illumination spatial coherence is an effective strategy to eliminate artifacts in metasurface holograms.
- This method enables the development of compact, dynamic holographic displays free from coherent defects.
