Metalens Design and Applications in Optical Systems

Metalenses are planar optical elements composed of arrays of subwavelength nanostructures that locally modulate the phase, amplitude and polarisation of light to achieve lensing functions in an ultrathin form factor. By tailoring the geometry and arrangement of dielectric or metallic pillars, designers can correct monochromatic and chromatic aberrations, achieve high numerical apertures and extend the field of view beyond the limits of conventional refractive optics. Recent advances in computational inverse design and fabrication methods have enabled record efficiencies, broadband operation and integration with electronic sensors, paving the way for miniaturised imaging systems, endoscopic probes, augmented-reality displays, holographic wavefront modulators and multi-functional optical chips. Key challenges remain in controlling dispersion, scaling up to large apertures, ensuring uniformity across wide angles and integrating metasurfaces into robust systems for industrial and consumer applications.

Research from Nature Portfolio

Recent studies have introduced a holographic augmented-reality display that combines inverse-designed full-colour metasurface gratings with a compact dispersion-compensating waveguide and machine-learning-assisted holography algorithms, eliminating bulky collimation optics and delivering vibrant three-dimensional imagery in a wearable form. Earlier foundational work demonstrated a monolithic metalens doublet corrected for monochromatic aberrations, integrated directly onto an image sensor to form a miniature planar camera with nearly diffraction-limited performance and a fisheye field of view. Another pioneering effort realised a see-through, anisotropic metalens eyepiece offering broadband, full-colour imaging and a wide field of view, highlighting the potential for mass-produced near-eye displays.

Metalens Design and Applications in Optical Systems publication trend

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

Technical terms

Metalens: A flat lens formed by a planar arrangement of nanoscale scatterers that impose spatially varying phase shifts on incident light to achieve focusing or imaging.

Metasurface: A two-dimensional array of engineered nanostructures designed to manipulate light at subwavelength scales, controlling phase, amplitude or polarisation.

Inverse Design: A computational methodology that specifies target optical functions and iteratively optimises nanoscale geometries to meet performance objectives.

Numerical Aperture (NA): A dimensionless quantity defining the range of incident angles a lens can accept or emit, directly influencing resolution and light-gathering ability.

Chromatic Aberration: Optical distortion arising from wavelength-dependent focus shifts, causing colour fringing and reduced image sharpness.

References

1. Full-colour 3D holographic augmented-reality displays with metasurface waveguides. Nature (2024).
2. High-efficiency high-numerical-aperture metalens designed by maximizing the efficiency limit. Optica (2024).
3. Miniature optical planar camera based on a wide-angle metasurface doublet corrected for monochromatic aberrations. Nature Communications (2016).
4. Metasurface eyepiece for augmented reality. Nature Communications (2018).
5. Large area metalenses: design, characterization, and mass manufacturing.. Optics Express (2018).
6. Dielectric metalens for miniaturized imaging systems: progress and challenges. Light: Science & Applications (2022).