Suppressing meta-holographic artifacts by laser coherence tuning
arXiv:2012.04768 · doi:10.1038/s41377-021-00547-0
Abstract
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.
arXiv commentSubmitted for review
References in corpus (12)
- A review of metasurfaces: physics and applications
- Metasurface holography: from fundamentals to applications
- Global optimization of dielectric metasurfaces using a physics-driven neural network
- Complete amplitude and phase control of light using broadband holographic metasurface
- Geometric phase from Aharonov-Bohm to Pancharatnam-Berry and beyond
- Complex Lasers with Controllable Coherence
- Efficient method for controlling the spatial coherence of a laser
- Freeform metagratings based on complex light scattering dynamics for extreme, high efficiency beam steering
- Coherence switching of a degenerate VECSEL for multimodality imaging
- Spatio-Temporal Supermodes:Rapid Reduction of Spatial Coherence in Highly Multimode Lasers
- Electrically pumped semiconductor laser with low spatial coherence and directional emission
- Intracavity frequency-doubled degenerate laser