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Artificial manipulation of light is significant for the material science and technology. In this work, noticeably enhanced light absorption with absorption above 99% has been demonstrated in a deep-subwavelength meta-surface structure. Dipolar plasmon resonance and near-field coupling of the plasmons between the adjacent core–shell metallo-dielectric spheres together with the optical field coupling by the dielectric shells are the main contributions for the multispectral light absorption. The predicted structure can be fabricated in large-area based on the standard colloidal self-assembled method and the metal deposition technique. These optical and structural features hold the proposed platform to be a potential of the application in light modulation and absorption and other optoelectronics. [ABSTRACT FROM AUTHOR]

Multi-band light perfect absorbers formed by metal-semiconductor materials are desirable for optoelectronics and have been long pursued. In this work, we numerically propose and demonstrate a four-band resonant near-perfect light absorption by utilizing the aluminum ring intercalated with silicon disk array, which can support strong plasmonic resonances and optical cavity modes. The multi-band near-perfect absorption can be tuned by the structural parameters and the maximal absorption is exceeding 99.8%. These features lay a foundation for low-cost optoelectronic technologies since the semiconductor silicon cavities are currently very important elements in the field of photonics. [ABSTRACT FROM AUTHOR]