A Highly Efficient Wide-Angle Symmetric Meta-Absorber in Visible to Near-Infrared

Absorber working in optical wavelength draws significant attraction due to its vast field of application. A high-efficiency metamaterial absorber (MMA) is proposed in this study to utilize solar radiation perfectly. The MMA achieves 97.5% of total average absorption for the wavelength 375 nm to 1000 nm. From 375 to 700 nm (visible band) it achieves 97.47% average absorption. This symmetrical meta-structure is polarization insensitive along with the independence of angular sensitivity up to 70°. Recent developments are discussed on the attainment of several desired absorber characteristics, including flexibility, tunability, polarization and angle independence, and broadband and multiband operation. Additionally, recommendations for future lines of inquiry are provided.