Diffractive Optical Elements in Imaging Systems

Diffractive optical elements (DOEs) are flat or hybrid microstructured surfaces that shape light through diffraction rather than refraction. By sculpting surface relief or embedding subwavelength features, these components can perform functions traditionally reserved for bulky lens assemblies, including beam shaping, focus control and aberration correction. Their inherent capacity to impart wavelength-dependent phase delays enables compact achromatic designs when combined with refractive optics or dispersion-engineered materials. Recent advances in materials science, nanofabrication and computational design have unlocked novel DOE architectures for broadband imaging, high-numerical-aperture systems and space telescopes. In ground-based and space-borne platforms, DOEs promise significant weight and volume reductions, improved imaging stability under temperature or pose changes, and the potential to tailor point-spread functions for enhanced contrast and resolution. Despite these opportunities, challenges persist in maximising diffraction efficiency over wide spectral and angular ranges, managing stray light from nondesign orders and integrating diffractive surfaces into high-throughput manufacturing workflows. Ongoing research seeks to bridge these gaps through new dispersion-engineered composites, multilayer and gradient-index structures, and hybrid reflective–diffractive schemes that fuse the best attributes of both modalities.

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Diffractive Optical Elements in Imaging Systems publication trend

The graph below shows the total number of articles in diffractive optical elements in imaging systems across all publications each year (not limited to Nature Index journals).

Technical terms

Diffractive Optical Element (DOE): A microstructured component that shapes or focuses light by diffractive phase modulation rather than refraction or reflection.

Diffraction Efficiency: The fraction of incident optical power directed into the desired diffraction order, often varying with wavelength and incidence angle.

Chromatic Aberration: Wavelength-dependent focal shift or image blur arising when dispersive elements refract or diffract different colours by different angles.

Numerical Aperture (NA): A dimensionless parameter characterising the light-gathering ability and resolution potential of an optical element or system.

Modulation Transfer Function (MTF): A measure of an imaging system’s ability to preserve contrast at varying spatial frequencies, indicative of its resolving power.

References

1. A High-Precision Real-Time Pose Measurement Method for the Primary Lens of Large Aperture Space Telescope Based on Laser Ranging. Sensors (2023).
2. Dispersion-engineered nanocomposites enable achromatic diffractive optical elements. Optica (2019).
3. General design formalism for highly efficient flat optics for broadband applications.. Optics Express (2020).
4. Design of achromatic annular folded lens with multilayer diffractive optics for the visible and near-IR wavebands.. Optics Express (2020).