2,202 research outputs found
Highly tunable polarized chromatic plasmonic films based on sub-wavelength grating templates
A kind of polarized chromatic plasmonic film is proposed based on subwavelength grating structure, which enables āblue transmissionā for the transverse electric light and āred transmissionā for the transverse magnetic light. Metalāinsulatorāmetal plasmonic waveguiding and metallic nanowire scattering are revealed to be responsible for the chromatic shift. Based upon the unique transmission spectrum characteristics of such films, polarized chromatic plasmonic tags (PCPTs) can be flexibly fabricated by patterning dielectric grating templates with designed figures and depositing appropriate thickness of metal. These PCPTs, simultaneously possessing directly visible unpolarized transmission colors and concealed distinct polarizationādependent color shift, can be widely used as antiācounterfeiting tags with higher security than the diffractive types of holograms
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