Multi-spectral near perfect metamaterial absorbers using spatially multiplexed plasmon resonance metal square structures

TL;DR

This paper demonstrates near-perfect multi-spectral infrared light absorption using multiplexed metal square plasmon resonance structures, achieving over 95% absorption at multiple wavelengths for potential applications in sensing and energy harvesting.

Contribution

It introduces a novel multiplexed metal square design for multi-spectral metamaterial absorbers with high absorption efficiency and analyzes the underlying plasmon resonance modes.

Findings

Over 95% absorption in dual-band structures

Over 92.5% absorption in triple-band structures

Absorption peaks determined by metal square sizes

Abstract

Near perfect infrared light absorption at multi-spectral wavelengths has been experimentally demonstrated by using multiplexed metal square plasmon resonance structures. Optical power absorption over 95% has been observed in dual-band metamaterial absorbers at two separate wavelengths and optical power absorption over 92.5% has been observed in triple-band metamaterial absorbers at three separate wavelengths. The peak absorption wavelengths are primarily determined by the sizes of the metal squares in the multiplexed structures. Electrical field distributions in the middle of the dielectric spacer layer were calculated at the peak absorption wavelengths. It is shown that strong light absorption corresponds to the local quadrupole plasmon resonance modes in the metamaterial structures.