# Highly efficient and broadband wide-angle Holography Using Patch-Dipole Nano-antenna Reflectarrays

## TL;DR

This paper presents a novel nano-antenna reflectarray design that achieves wide-angle, broadband, and efficient holography with high fidelity images at large angles and over a broad spectral range.

## Contribution

The work introduces coupled dipole-patch nano-antenna cells for holography, enabling high-efficiency, broadband, and wide-angle reflection holography with precise phase control.

## Key findings

- Achieved 40%-50% efficiency over 180nm bandwidth.
- Projected high-fidelity images at 45° and 20° angles.
- Excellent agreement with theoretical models across spectral range.

## Abstract

We demonstrate wide-angle, broadband and efficient reflection holography by utilizing coupled dipole-patch nano-antenna cells to impose an arbitrary phase profile on of the reflected light. High fidelity images were projected at angles of 450 and 200 with respect to the impinging light with efficiencies ranging between 40%-50% over an optical bandwidth exceeding 180nm. Excellent agreement with the theoretical predictions was found at a wide spectral range. The demonstration of such reflectarrays opens new avenues towards expanding the limits of large angle holography.

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Source: https://tomesphere.com/paper/1702.02337