2016/05/23 by Eshaghian, Ali, AbdollahRamezani, Sajjad, Chizari, Ata +1
#FOS: Physical sciences #Optics (physics.optics)
paper · doi:10.48550/arxiv.1605.07208
In this paper, a plasmonic absorber consisting of a metal-dielectric-metal stack with a top layer of Sierpinski nanocarpet is theoretically investigated. Such compact absorber depicts broadband angle-independent behavior over a wide optical wavelength range (400-700 nm) and a broad range of angles of light incidence (0-80∘). Including several feature sizes, such fractal-like structure shows widely strong extinction (85-99%) response for either transverse electric or magnetic polarization states under normal incidence. Underlying mechanisms of absorbance due to excited surface plasmon modes as well as electric/magnetic dipole resonances are well revealed by investigating electric field, magnetic field and current distributions. The proposed absorber opens a path to realize high-performance ultrathin light trapping devices.