Application of Oblique Metal Island Films to Optical Polarizing Films

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  • 傾斜微粒子島状金属薄膜の偏光フィルムヘの応用
  • 傾斜微粒子島状金属薄膜の偏光フィルムへの応用
  • ケイシャ ビリュウシ シマジョウ キンゾク ハクマク ノ ヘンコウ フィルム エ ノ オウヨウ

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An ultra-thin optical polarizing film using a periodic multiplayer consisting of oblique metal island (OMI) layers and glasslayers was investigated theoretically. The OMI films are composed of prolate metal nanoclusters (i.e. islands) inclined to one side. The OMI films are fabricated using a conventional vacuum evaporation system in which a substrate is inclined at 70-80 degrees. The OMI films exhibit resonance-type absorption in the visible and near-infrared region and large optical anisotropy because resonance wavelengths for the polarization along the shorter and longer axes of the prolate metal nanoclusters are different from each other. Therefore, the multilayer using the OMI films were used as optical polarizing films at the resonance wavelengths. However, the optical anisotropy of fabricated OMI films was not so large because the shape and size of nanoclusters in the films is not homogeneous. In this work, we calculate the theoretical characteristics of the polarizing films composed of ideal and homogeneous silver OMI layers. The polarizing film for 700 nm with the extinction ratio of 30 dB and the insertion loss of 0.03 dB was designed. When aluminum OMI layers are used, polarizing films for the shorter wavelength can be designed. Once techniques to fabricate ideal and homogeneous OMI films are developed, polarizing films with high extinction ratio will be available.

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