15 October 2012 Surface-plasmon holography with white light illumination
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In various metamaterials, surface plasmon polaritons (SPPs) play important roles to produce novel electromagnetic functions through the field enhancement, the dispersion modification, and the frequency tunability. Here, we apply the function of the SPP to a color 3D image display with white-light back-illumination. We reconstructed the color image from a hologram with white-light by using SPP. The hologram is recorded as corrugations of a silver film, which is covered by a SiO2 film to modify the color dispersion of the SPP. A single-color light in the white-light is separated as the SPP owing to the color dispersion. The SPP is diffracted by the hologram to reconstruct the three dimensional wavefront with the selected color. To obtain a multi-color image, RGB-color holograms are recorded with azimuthal-angle multiplex and are reconstructed simultaneously. The silver is used as the metal film so that the SPP of whole visible region can be excited. The silver film is 55-nm thickness, in which the SPP is excited efficiency. The SiO2 film enhances color selectivity, but if its thickness overs 25-nm, SPP in high optical frequency such as blue vanishes. Corrugation depth is up to 25-nm, within which brightness of the image monotonically increases with the depth. If the depth overs the 25-nm, the brightness is decreased. The SPP on the corrugated silver surface and SiO2 film have made color selectivity to a thin hologram. The SPP color holography gives a new white-light reconstruction technique using back-lighting.
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Miyu Ozaki, Miyu Ozaki, Jun-ichi Kato, Jun-ichi Kato, Satoshi Kawata, Satoshi Kawata, "Surface-plasmon holography with white light illumination", Proc. SPIE 8455, Metamaterials: Fundamentals and Applications V, 84550K (15 October 2012); doi: 10.1117/12.930161; https://doi.org/10.1117/12.930161


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