Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband, Polarization-insensitive and Wide-angle Optical Absorber
  based on Fractal Plasmonics   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 ($0-80^{\circ}$). 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.

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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: math
16
The categories of this paper are: stat
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The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an