Abstract
In the last few years, much attention has been paid to the researches
of metallic helical metamaterials due to their giant circular dichroism for
transmitted lights. However, so far as we know, there is little work concerning
the study of their reflection properties, which are also significant questions
for the helical metamaterials. In this work, we study the reflection properties
of the helical metamaterials by using the Finite-Difference Time-Domain (FDTD)
method. The circular dichroism and the reflected polarization states of left-handed
single-, double-, triple-, and quadruple-helical structures are investigated,
respectively. It's found that both the single- and the double-helical structures
perform giant circular dichroism, and their reflected polarization states
are related to the handedness of helical structure; while triple- and quadruple-helical
structures exhibit no circular dichroism at all, and their reflected polarization
states are irrelevant to the handedness of helical structure.
© 2012 IEEE
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