POLARIZING ELEMENT, METHOD FOR MANUFACTURING POLARIZING ELEMENT AND OPTICAL INSTRUMENT

• Main Authors: TAKEDA TOMU, SAGAWA HIDETO
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide a polarizing element having a high transmittance for polarized light along a transmission axis and a low reflectance for polarized light along an absorption axis without adjusting a pitch, width or height of projections.SOLUTION: A polarizing plate of the present invention is a polarizing element having a wire grid structure including a transparent substrate 20 and projections 40 which are arranged on a main surface 22 at a pitch p40 shorter than a wavelength of light in a use band and extend in a Y direction. The projection has a laminate 50 in which dielectric layers 52 and conductive layers 54 are alternately stacked into two or more sets along a Z direction. The conductive layers 54 include a first conductive layer 55 having absorptivity for the light in the use band, and a second conductive layer 56 having reflectivity for the light in the use band. The first conductive layer 55 is disposed as the conductive layer 54 nearest to the incidence side of light.SELECTED DRAWING: Figure 2 【課題】凸部のピッチ、幅、高さ、を調節しなくても、透過軸の偏光の透過率が高く、かつ吸収軸の偏光の反射率が低い偏光素子を提供する。【解決手段】本発明の偏光板は、ワイヤグリッド構造を有する偏光素子であって、透明基板２０と、使用帯域の光の波長より短いピッチｐ４０で主面２２に配列され、Ｙ方向に延びる凸部４０と、を備える。凸部は誘電層５２と導電層５４とがＺ方向に沿って交互に２組以上積層された積層体５０を有する。導電層５４は使用帯域の光に対して吸収性を有する第１導電層５５と使用帯域の光に対して反射性を有する第２導電層５６を含む。光の入射側に最も近い導電層５４としては、第１導電層５５が設けられている。【選択図】図２