Partially coherent double phase holography in visible using meta-optics

TL;DR

This paper demonstrates polarization-independent, amplitude and phase modulating meta-optical holography using double-phase holography with dielectric meta-optics, effective under both laser and LED illumination, reducing complexity and speckles.

Contribution

It introduces a novel approach for meta-optical holography that encodes both amplitude and phase, works with partially incoherent light, and improves hologram quality.

Findings

Structural similarity of holograms improved by ~3x over phase-only holography.

Holography achieved with LED illumination, reducing alignment and speckle issues.

Demonstrated polarization-independent, complex holography using dielectric meta-optics.

Abstract

Ultrathin flat meta-optics have shown great promise for holography in recent years. However, most of the reported meta-optical holograms rely on only phase modulation and neglect the amplitude information. Modulation of both amplitude and phase in meta-optics either requires polarization sensitive meta-atoms, or complex scatterers with stringent fabrication requirements. Additionally, almost all the meta-optical holograms were measured under laser illumination. Here we adopt the concept of double-phase holography, to report polarization-independent holography with both amplitude and phase modulation, using dielectric meta-optics. We validate the implementation of complex phase hologram by measuring an improvement of structural similarity of the reconstructed hologram by ~3x over phase-only holograms. Finally, we demonstrate that meta-optical holography can also be realized using partially incoherent light from a light emitting diode. This observation can significantly reduce the alignment complexity and speckles in laser-based meta-optical holography.