Nanofocusing of light energy by ridged metal heterostructures
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With regard to thin Ag and Al films of the same thickness, the phase velocity of surface plasmon polaritons (SPPs) on the Ag surface is smaller than that on the Al surface. We have designed a ridged metal heterostructure (RMH) for nanofocusing of light energy. Finite difference time domain simulations reveal that the RMHs constructed with both the Ag and Al films can result in giant local field enhancement, instead of around the sharp corners, as the triangular metal nanocrystals constructed with a homogeneous metal material do, in the middle part of the structures. Further assembly of the RMHs can construct interesting nanoantennas and array probes, implying potential applications of the RMHs in nanophotonics and biophotonics.
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