Surface-plasmon holography with white light illumination
Surface-plasmon holography with white light illumination
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DOI：
10.1117/12.930161
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
M. Ozaki;J. Kato;S. Kawata
中科院分区：
文献类型：
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作者：
M. Ozaki;J. Kato;S. Kawata
表面等离子体激元（SPPs）在各种异向介质中通过场增强、色散修正和频率可调谐等作用产生新的电磁功能。在这里，我们将SPP的功能应用于具有白光背照明的彩色3D图像显示器。我们用表面等离子体全息术再现了白光全息图的彩色像。全息图被记录为银膜的波纹，其被SiO2膜覆盖以修改SPP的色散。白光中的单色光由于色散而被分离为SPP。SPP被全息图衍射以用所选择的颜色重建三维波前。为了获得多色图像，RGB彩色全息图被记录与方位角复用，并同时重建。采用银作为金属膜，可以激发整个可见光区的SPP。银膜的厚度为55 nm，其中SPP是激发效率。SiO2膜增强了颜色选择性，但是如果其厚度超过25 nm，则蓝光等高光频的SPP消失。波纹深度高达25 nm，在此范围内，图像的亮度随深度单调增加。如果深度超过25纳米，亮度就会降低。波纹状银表面的SPP和SiO_2膜对薄全息图具有色选择性。SPP彩色全息术提供了一种新的利用背光的白光再现技术。
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.