Abstract
Metal films with a periodic arrangement of cut-through slits are studied
to show that artificial surface conductivity is created at the flat interface
between the periodic slits and the cover/substrate. The presence of surface
conductivity when the periodic structure is modeled by an effective refractive
index can describe how non-specular higher diffracted orders affect the specular
zeroth diffracted order. The magnitude of this surface conductivity is controlled
geometrically. The artificial surface conductivity is pure imaginary and thus
reactive if all non-specular orders are evanescent. This is usually the case
in the low frequency regime. At higher working frequencies when some non-specular
diffracted orders are non-evanescent, however, the artificial surface conductivity
becomes complex and thus resistive. The power lost in the resistive part of
the surface conductivity represents the power, which is carried away from
the specular direction.
© 2012 IEEE
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