Graphene-Based Optics for Advanced Imaging Systems

Graphene-based optics harness the exceptional mechanical resilience, high refractive index and broadband transparency of atomically thin carbon to reshape the landscape of advanced imaging. By embedding monolayer or few-layer graphene into diffractive and metasurface architectures, researchers have realised ultrathin lenses, tuneable Fresnel elements and orbital angular momentum (OAM) metalenses that rival or surpass the performance of bulky refractive optics. Fabrication techniques such as femtosecond laser writing, chemical vapour deposition and direct laser transfer enable precise control of phase and amplitude on flexible substrates, paving the way for compact endoscopic probes, on-chip microscopes and wearable augmented-reality displays. Graphene’s dispersionless behaviour across visible and near-infrared wavelengths facilitates broadband operation, while its conductivity permits electrical modulation of focal length and beam shape. Recent efforts have integrated graphene optics with conventional elements to yield hybrid systems offering subwavelength focusing, dynamic tuning and selective spectral filtering. Such innovations promise to deliver lightweight, low-cost imaging modules for biomedical diagnostics, space exploration and consumer electronics, marking a significant advance towards fully integrated, high-resolution photonic platforms.

Research from Nature Portfolio

Building on the giant refractive index modulation of graphene oxide, ultrathin flat lenses of just 200 nm thickness have been demonstrated to achieve three-dimensional subwavelength focusing with diffraction-limited resolution and focusing efficiencies exceeding 30% over the 400–1,500 nm band. These sprayable, flexible lenses afford scalable fabrication and mechanical robustness, enabling integration into on-chip nanophotonic systems. Complementary work on three-dimensional structured graphene metamaterials has yielded absorptive elements with tunable wavelength selectivity, omnidirectional capture and excellent thermal stability. Although primarily developed for solar-thermal conversion, the underlying design principles—metallic trench-like structures combined with ultrathin graphene films—offer a blueprint for next-generation spectral filters and thermal detectors in infrared imaging arrays.

Graphene-Based Optics for Advanced Imaging Systems publication trend

The graph below shows the total number of articles in graphene-based optics for advanced imaging systems across all publications each year (not limited to Nature Index journals).

Technical terms

Graphene: A single layer of carbon atoms in a hexagonal lattice, noted for its high refractive index, electrical conductivity and mechanical flexibility.

Diffractive optics: Optical elements that shape and control light by engineered micro- or nano-scale surface features to impart spatially varying phase shifts.

Metalens: A flat lens composed of subwavelength resonators or scatterers that achieve focusing through local phase control rather than curved geometry.

Metamaterial: An artificial composite with tailored electromagnetic properties arising from its structured subwavelength constituents rather than its base material.

Orbital angular momentum (OAM): A property of light beams carrying a helical phase front, used for multiplexing in imaging and communications.

Laser-induced graphene (LIG): Graphene formed by laser irradiation of carbon precursors, enabling direct patterning of conductive and optical structures.

References

1. Ultra-thin light-weight laser-induced-graphene (LIG) diffractive optics. Light: Science & Applications (2023).
2. Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting. Ultrafast Science (2023).
3. Structured graphene metamaterial selective absorbers for high efficiency and omnidirectional solar thermal energy conversion. Nature Communications (2020).
4. Diffraction-limited imaging with monolayer 2D material-based ultrathin flat lenses. Light: Science & Applications (2020).
5. Highly efficient and ultra-broadband graphene oxide ultrathin lenses with three-dimensional subwavelength focusing. Nature Communications (2015).
6. Electrically focus-tuneable ultrathin lens for high-resolution square subpixels. Light: Science & Applications (2020).