Diffractive Optics Design and Applications

Diffractive optics harness microscale surface relief patterns to sculpt optical wavefronts through diffraction, offering compact, lightweight alternatives to conventional refractive lenses. Recent advances have focused on design methodologies, fabrication precision and integration with computational algorithms to overcome challenges such as chromatic dispersion, fabrication errors and limited numerical apertures. Multi-level and inverse-designed diffractive optical elements now achieve broadband achromatic focusing, extreme depth of focus and high-efficiency performance across visible to terahertz regimes. This convergence of nanofabrication, computational design and end-to-end optimisation has expanded practical applications from high-resolution imaging and spectroscopy to on-chip photonics and THz systems. Ongoing work emphasises manufacturability at scale, error tolerance and the co-development of optics with image-reconstruction algorithms to enable thinner, low-cost imaging systems, compact spectral devices and integrated photonic circuits.

Research from Nature Portfolio

Recent studies have demonstrated controlled subsurface nanofabrication inside silicon using spatially modulated laser beams and anisotropic feedback, enabling buried nanostructures with feature sizes below 120 nm. These structures serve as high-efficiency nanogratings with tailored spectral control, marking progress towards three-dimensional photonic systems and integrated electronic-photonic platforms. Another computational framework has employed pixelated polymer structures modelled by scalar diffraction to design ultra-thin, fabrication-error tolerant terahertz optical elements, including broadband aberration-corrected lenses, spectral splitters and transmissive holograms. Foundational work on planar achromatic diffractive lenses has further shown multi-level microstructures capable of focusing the entire visible spectrum with suppressed chromatic aberration and diffraction-limited performance, demonstrating cost-effective manufacturing and replication advantages over alternative flat optics.

Research from all publishers

Design approaches that integrate fabrication-proximity effect modelling with wave optics simulation have been proposed to ensure that diffractive optical elements meet both optical specifications and manufacturability. This fabrication-integrated design strategy reduces discrepancies between intended and realised surface profiles, resulting in beam splitters with over 25 % fewer unwanted diffraction orders and improved performance in digital holography and extended depth-of-focus imaging. End-to-end optimisation paradigms have also emerged, leveraging rotationally symmetric diffractive achromats and neural image-recovery networks to jointly optimise element geometry and reconstruction algorithms. These learned designs achieve higher optical transfer function amplitudes at critical spatial frequencies across the visible band, delivering enhanced image fidelity and thin-form factor imaging systems suitable for diverse real-world scenes.

Diffractive Optics Design and Applications publication trend

The graph below shows the total number of articles in diffractive optics design and applications across all publications each year (not limited to Nature Index journals).

Technical terms

Diffractive optical element: A microstructured component that shapes light by diffraction to achieve functions such as focusing, splitting or spectral dispersion.

Numerical aperture: A dimensionless number characterising the range of angles over which a system can accept or emit light, affecting resolution and efficiency.

Chromatic aberration: Wavelength-dependent focal shift caused by dispersion in optical materials, leading to colour fringing in imaging systems.

Scalar diffraction: A simplified optical model that describes light propagation and diffraction assuming negligible vectorial effects of polarisation.

Inverse design: A computational approach that optimises the geometry of an optical element by iteratively adjusting parameters to meet specified performance metrics.

References

1. Laser nanofabrication inside silicon with spatial beam modulation and anisotropic seeding. Nature Communications (2024).
2. Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing. Scientific Reports (2016).
3. A Computational Design Framework for Efficient, Fabrication Error-Tolerant, Planar THz Diffractive Optical Elements. Scientific Reports (2019).
4. Extreme-depth-of-focus imaging with a flat lens. Optica (2020).
5. Large-area, high-numerical-aperture multi-level diffractive lens via inverse design. Optica (2020).
6. Learned rotationally symmetric diffractive achromat for full-spectrum computational imaging. Optica (2020).
7. Fabrication-integrated design for diffractive optical elements. Optica (2025).