Abstract
We fabricated arrays of subwavelength slits in an Al film and measured
their optical properties in the visible light region. Al crossbeams were installed
as supports between the Al lines to enable us to precisely fabricate the nanoslits.
Visible light polarized parallel to the slits transmits at shorter wavelengths,
similar to that of a wire grid array at infrared wavelengths. On the other
hand, for light polarized perpendicular to the slits, the transmission is
at longer wavelengths and significant absorption takes place at shorter wavelengths
due to Fano-type interference. This absorption in the visible wavelength region
is due to the precise nanofabrication process and the high plasma frequency
of Al. These results show that Al nanoslits can be used as polarization filters
in the visible wavelength region.
© 2012 IEEE
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