Solar energy broadband capturing by metamaterial absorber based on titanium metal

Area of Science:

• Nanophotonics and Metamaterials
• Renewable Energy Technologies
• Optical Engineering

Background:

• Growing energy scarcity drives demand for efficient solar energy capture solutions.
• Existing solar absorbers face limitations in bandwidth, angular dependence, and material versatility.
• Advanced optical structures are crucial for enhancing solar energy harvesting efficiency.

Purpose of the Study:

• To propose and investigate a novel ring surrounding disk (RSD) absorber for enhanced solar energy capture.
• To evaluate the absorption performance, polarization independence, and angular stability of the proposed RSD absorber.
• To demonstrate the potential of the RSD absorber for solar energy applications and other electromagnetic phenomena.

Main Methods:

• Design and simulation of a nanostructured absorber based on the ring surrounding disk (RSD) geometry.
• Analysis of optical absorption spectra across a broad wavelength range (300-4000 nm).
• Investigation of absorption performance under varying polarization states and incidence angles.

Main Results:

• The RSD absorber exhibits high average absorption (96.95%) and maintains >93.5% absorption across the 300-4000 nm spectrum.
• The absorber demonstrates polarization-independent absorption characteristics.
• Excellent absorption (>90%) is maintained up to an incidence angle of 52°, with >95% absorption under large process tolerances.

Conclusions:

• The proposed RSD absorber is a highly efficient and robust design for solar energy capture.
• The generalized structure is adaptable to various metals and dielectric materials, offering design flexibility.
• The absorber shows significant potential for applications in solar energy conversion, thermal emitters, and electromagnetic cloaking.