Wide viewing angle realization for sampled hologram by collecting high-order diffraction beams

TL;DR

This paper introduces a method to expand the viewing angle of sampled holograms by utilizing high-order diffraction beams generated by pixel sampling, enabling wider viewing zones and 3D image retrieval.

Contribution

The study demonstrates that collecting high-order diffraction beams from sampled holograms can significantly increase the viewing angle of reconstructed images.

Findings

High-order diffraction beams extend viewing zones.

Numerical analysis confirms increased viewing angles.

Fourier holograms enable 3D perspective retrieval.

Abstract

We propose that viewing angle expansion of the holographic image can be realized by using high-order diffraction beams caused by the pixel structure sampling the hologram data. The diffractive beam propagating to new optical axis direction plays a role in a modulated carrier similar to a carrier signal of the off-axis holography, which makes new viewing zone of the reconstruction image. The reconstructed image in the Fresnel hologram is deformed along new viewing direction, whereas the Fourier hologram enables to retrieve three-dimensional image with other perspective. High resolution hologram fringe is imaged on the image plane through an imaging system, and thus, only collection of diffracted beams increases a viewing zone angle. We verify our proposal through the numerical analysis for the sampled hologram showing high-order diffraction beams with various viewing zones.