Four-Fold Color Filter Based on Plasmonic Phase Retarder
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Abstract
We
present a plasmonic color filter based on periodic subwavelength
silver nanowires, capable of changing the output color by simple rotation
of a polarizer. The effect is enabled by a wavelength-dependent phase
shift near the plasmon resonance, giving rise to a wavelength-dependent
rotation of the incident polarization. Subsequent rotation of an analyzing
polarizer leads to an output of four distinct colors (e.g., yellow,
blue, purple, and red) and combinations thereof. The plasmon resonance
itself can be tuned throughout the visible spectral region by proper
choice of fabrication parameters