Broadband and efficient diffraction

TL;DR

This paper demonstrates a method to achieve broadband blazing in diffractive optical components over nearly an octave by using advanced design and artificial dielectric materials with strong dispersion, enabling more efficient and versatile optical devices.

Contribution

It introduces a novel approach combining advanced optical design and artificial dielectrics to achieve broadband blazing, overcoming wavelength limitations of traditional diffractive components.

Findings

Achieved nearly octave-wide broadband blazing experimentally.

Used artificial dielectric materials with strong dispersion.

Enhanced efficiency and control in diffractive optical components.

Abstract

Surface topography dictates the deterministic functionality of diffraction by a surface. In order to maximize the efficiency with which a diffractive optical component, such as a grating or a diffractive lens, directs light into a chosen order of diffraction, it is necessary that it be "blazed". The efficiency of most diffractive optical components reported so far varies with the wavelength, and blazing is achieved only at a specific nominal energy, the blaze wavelength. The existence of spurious light in undesirable orders represents a severe limitation that prevents using diffractive components in broadband systems. Here we experimentally demonstrate that broadband blazing over almost one octave can be achieved by combining advanced optical design strategies and artificial dielectric materials that offer dispersion chromatism much stronger than those of conventional bulk materials. The possibility of maintaining an efficient funneling of the energy into a specific order over a broad spectral range may empower advanced research to achieve greater control over the propagation of light, leading to more compact, efficient and versatile optical components.