| abstract |
(57) [Summary] [Object] To manufacture a diffraction grating capable of diffracting a wide wavelength range by laminating two or more kinds of polymer layers having different refractive indexes so that the thicknesses of some layers are different. [Structure] High refractive index polymer layers 1, 3, 5 and low refractive index polymer layers 2, 4, such that layers composed of two or more polymers having different refractive indexes are repeated with relatively high and low refractive indexes. 6 is laminated in order by a coating method to produce. By stacking layers with different thicknesses, the diffraction wavelength range can be set to 800 nm to 2000 nm, In this case, a good heat ray reflective film that transmits visible light and reflects heat rays is obtained. In addition, it can be applied to a color filter that reflects light of a specific wavelength in the visible region, an ultraviolet cut film, and the like. |