Multi-plane, Multi-band image projection via Broadband Diffractive Optics

TL;DR

This paper introduces Broadband Diffractive-Optical Elements (BDOEs) capable of projecting multiple images across different spectral bands and planes, with adjustable magnification, flat and reflective designs, all under broadband illumination.

Contribution

The work presents novel BDOEs that enable multi-plane, multi-band image projection with adjustable magnification and flat or reflective configurations, fabricated via cost-effective imprint techniques.

Findings

Demonstrated different images in spectral bands and planes

Achieved image magnification by source distance adjustment

Developed flat and reflective BDOEs with high efficiency

Abstract

We demonstrate visible and near-IR image projection via non-absorbing, multi-level Broadband Diffractive-Optical Elements (BDOEs) in 1 or more planes. By appropriate design of the BDOE topography, we experimentally demonstrate: (1) different images in different spectral bands; (2) different images in different image planes; (3) image magnification by changing the distance between the illumination source and the BDOE; (4) completely flat BDOE via an index-contrast top-coating; and (5) reflective BDOEs. All of these are accomplished with broadband illumination. Furthermore, the BDOEs are highly efficient, versatile and can be inexpensive mass manufactured using imprint-based replication techniques.