Metamaterial Absorbers for Solar Energy Applications

Metamaterial absorbers are artificially engineered structures designed to manipulate light–matter interactions in ways unattainable with conventional materials. By arranging subwavelength resonators into periodic arrays, these devices can achieve near-unity absorption over selected spectral bands or across the entire solar spectrum. Key design strategies include metal–insulator–metal (MIM) stacks, plasmonic nanostructures and impedance-matched surfaces, each exploiting resonant modes to trap and dissipate incident photons as heat or to funnel energy into photovoltaic layers. Advances in fabrication have enabled ultrathin, flexible and angle-insensitive designs that maintain performance under mechanical deformation and varying illumination conditions. These developments hold promise for next-generation solar thermal collectors, thermophotovoltaic systems and light-trapping layers in photovoltaics, offering enhanced efficiency, reduced material usage and potential integration onto curved or wearable platforms.

Research from Nature Portfolio

Recent studies have demonstrated a flexible, polarisation-insensitive metamaterial absorber employing a nickel–silica–nickel metal–insulator–metal architecture. This design achieves near-unity broadband absorption across the ultraviolet to near-infrared range (300 nm to 1.6 µm) with an average of 95.8 % and a peak of 99.999 %. Mechanical bending tests confirm stable optical performance under deformation, while analysis under standard AM 1.5 solar conditions underscores its suitability for curved photovoltaic and solar-thermal surfaces.

Metamaterial Absorbers for Solar Energy Applications publication trend

The graph below shows the total number of articles in metamaterial absorbers for solar energy applications across all publications each year (not limited to Nature Index journals).

Technical terms

Metamaterial absorber: Artificially engineered composite structure designed to achieve near-unity absorption through tailored electromagnetic responses.

Metal–insulator–metal (MIM) structure: Layered configuration of metal and dielectric materials commonly used to support resonant absorption modes.

Plasmonic resonance: Collective oscillation of conduction electrons at a metal–dielectric interface that confines and amplifies electromagnetic fields.

Impedance matching: Tailoring the absorber’s effective impedance to that of free space to minimise reflection and maximise absorption.

AM 1.5 spectrum: Standard reference solar irradiance profile at the Earth’s surface used for evaluating photovoltaic and absorber performance.

References

1. Polarization and angular insensitive bendable metamaterial absorber for UV to NIR range. Scientific Reports (2022).
2. Tungsten-based highly selective solar absorber using simple nanodisk array.. Optics Express (2017).
3. Ultra-broadband, polarization-independent, wide-angle absorption in impedance-matched metamaterials with anti-reflective moth-eye surfaces.. Optics Express (2018).