Rainbow and blueshift effect of a dispersive spherical invisibility cloak impinged on by a nonmonochromatic plane wave.

نویسندگان

  • Baile Zhang
  • Bae-Ian Wu
  • Hongsheng Chen
  • Jin Au Kong
چکیده

We demonstrate some interesting phenomena associated with a nonmonochromatic plane wave passing through a spherical invisibility cloak whose radial permittivity and permeability are of Drude and Lorentz types. We observe that the frequency center of a quasimonochromatic incident wave will suffer a blueshift in the forward scattering direction. Different frequency components have different depths of penetration, causing a rainbowlike effect within the cloak. The concept of group velocity at the inner boundary of the cloak needs to be revisited. Extremely low scattering can still be achieved within a narrow band.

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عنوان ژورنال:
  • Physical review letters

دوره 101 6  شماره 

صفحات  -

تاریخ انتشار 2008