Abstract
We proposed a nanoplasmonic optical filtering technique based on complementary
split-ring resonator structures. Interestingly, the proper plasmonic modes
of the nanoring in the side-coupled arrangement can be selected and excited
by the proposed structures. It is observed that the non-integer modes can
be excited due to the presence of a metallic nano-wall as well as the integer
modes. Furthermore, the numerical results indicate that the optical transmission
spectrum of the investigated filter can be efficiently modified and tuned
by manipulation either the position or the width of the employed nano-wall
inside the metal-insulator-metal ring. The antinodes of the magnetic field
of these modes, located on the symmetry plane of the proposed structures,
can be manipulated by the position of the wall. Additionally, these modes,
in particular the fundamental mode, are highly sensitive to the nano-wall
dimensions. It indicates that the proposed nanofilter is a promising candidate
as a tunable filter in nanophotonics applications.
© 2013 IEEE
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