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The calculated TM mode reflection spectra for gold-coated silicon nanopillars based high pass filter. In TM mode, the incident light is polarized parallel to the wire structures and at the plasma frequency fp of 300 THz (λp = 1.00 μm) a sharp drop in reflectivity is calculated.
(a) Electron microscopy image of a 2D square lattice array of gold coated Si nanopillars with radius of 50 nm and lattice constant of 300 nm. (b) The same in higher resolution. The tungsten mask can be observed on the nanopillars tip.
The reflection spectra measured at individual angles for light polarized (a) parallel (TM mode) and (b) perpendicular (TE mode) to the gold coated Si nanopillars. A sharp drop in the reflected TM mode is observed at plasma frequency (λp = 1.00 μm), matching closely with theory.
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