Twisted split-ring-resonator photonic metamaterial with huge optical activity
M. Decker, R. Zhao, C.M. Soukoulis, S. Linden, and M. Wegener
Opt. Lett. 35, 1593 (2010)
Coupled split-ring-resonator metamaterials have previously been shown to
exhibit large coupling effects, which are a prerequisite for obtaining
large effective optical activity. By a suitable lateral arrangement of
these building blocks, we completely eliminate linear birefringence and
obtain pure optical activity and connected circular optical dichroism.
Experiments around a 100 THz frequency and corresponding modeling are in
good agreement. Rotation angles of about 30° for 205 nm sample
thickness are derived.