Narrowband and flexible perfect absorber based on a thin-film nano-resonator incorporating a dielectric overlay.

ABSTRACT: We developed a flexible perfect absorber based on a thin-film nano-resonator, which consists of metal-dielectric-metal integrated with a dielectric overlay. The proposed perfect absorber exhibits a high quality (Q-)factor of ~ 33 with a narrow bandwidth of ~ 20 nm in the visible band. The resonance condition hinging on the adoption of a dielectric overlay was comprehensively explored by referring to the absorption spectra as a function of the wavelength and thicknesses of the overlay and metal. The results verified that utilizing a thicker metal layer improved the Q-factor and surface smoothness, while the presence of the overlay allowed for a relaxed tolerance during practical fabrication, in favor of high fidelity with the design. The origin of the perfect absorption pertaining to zero r

SUBMITTER: Park CS 

PROVIDER: S-EPMC7576172 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature