Polarization-decoupled Flat Displays

TL;DR

This paper introduces a novel helicity multiplexing method using anisotropic nano-resonating antennas to create highly efficient, dual on-axis holograms in the visible spectrum with simplified design and fabrication.

Contribution

It presents a new helicity multiplexing technique that simplifies the design of asymmetric holograms using a single unit cell and geometric phase modulation.

Findings

Achieved dual holograms with high transmission efficiency in visible light.

Reduced design and fabrication complexity compared to previous methods.

Demonstrated high efficiencies of 55%, 75%, and 80% at blue, green, and red wavelengths.

Abstract

Many modern applications like entertainment displays, data encryption, security, and virtual reality (VR) technology require asymmetric light manipulation. Symmetric spin-orbit interactions (SOI) apply a limit in achieving an asymmetrical metahologram. However, different reported asymmetric SOI's based on propagation and geometric phase mergence techniques effectively break this limit at the expense of design complexity and greater computation cost. This work proposes a novel helicity multiplexing technique that breaks all the aforementioned barriers in achieving on-axis dual side holograms. Benefiting from the geometric phase modulation of anisotropic nano-resonating antennas, we have employed a single unit cell to achieve helicity multiplexing. A low extinction coefficient material a-Si:H is used for device analysis. Due to the simple single unit cell-based designing technique, simulation and fabrication complexities were significantly reduced. As a result, based on the helicity and incidence direction of electromagnetic wave, we have achieved highly transmissive dual holographic images in the visible band. Our simulated efficiencies are 55%, 75%, and 80% for the blue ({\lambda} = 488 nm), green ({\lambda} = 532 nm), and red light ({\lambda} = 633 nm).