Nanoimprint lithography is used to fabricate a metamaterial with the "fishnet" structure composed of Ag/a-Si/Ag layers
that exhibits negative refractive index in the near-infrared. We have carried out a femtosecond pump-probe experiment
to measure the transient photo-induced response of this structure. With a pump fluence of 330μJ/cm2 at 800nm, the
transmission at the magnetic resonance is increased by ~15.4%. The induced change originated from carrier excitation in
the a-Si layer has a fast decay constant of 1.1ps.
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