Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 28, Issue 22, Pages 2545-2548Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2016.2605503
Keywords
Plasmonic absorber; fractals structures
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In this letter, a plasmonic absorber consisting of a metal-dielectric-metal stack with a top layer of Sierpinski nanocarpet is theoretically investigated. Such a compact absorber depicts broadband angle-independent behavior over a wide optical wavelength range (400-700 nm) and a broad range of incidence angles (0 degrees-80 degrees). Including several feature sizes, such a fractal-like structure shows an average simulated extinction response of 0.85 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.
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