Abstract
The infrared propagation character of metallic woodpile photonic crystals made of gold in the <110> direction was studied. The bandgap in metallic woodpile was found to be interrupted by a new propagating mode far beyond the waveguide cutoff. This new passband cannot be explained by the defect mode of the photonic crystal or the waveguide theorem. However, studies of surface plasmons within the structure showed that 3-D metallic photonic crystals can expand the propagating mode far beyond waveguide cutoff. This passband mode can be adjusted by design allowing for new optical filtering devices using 3-D photonic crystals. Finite-difference-time-domain (FDTD) simulations were applied to explain this phenomenon and matched well with experimental results.
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