Wire-grid polarizers in the volume plasmon region.
The properties of silver and aluminium wire-grid polarizers are examined in the volume plasmon frequency region where the transmittances of field with polarizations parallel and perpendicular to the grid lines are reversed with respect to their behavior outside the plasma region. Analysis of the behavior is conducted with effective approximate refractive index formulae and by simulations with rigorous Fourier modal method. The parallel polarization behaves as in a homogenous thin metal film while the perpendicular field is absorbed in the plasma region and transmitted otherwise. We further explain the performance by viewing the distribution of the field intensities inside the grating.
Lehmuskero
Anni
A
Department of Physics and Mathematics, University of Joensuu, Joensuu, Finland. anni.lehmuskero@joensuu.fi
Bai
Benfeng
B
Vahimaa
Pasi
P
Kuittinen
Markku
M