| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polarization diffraction grating that enables the polarization direction of incident light and the occurrence direction of diffracted light to be freely selected without being restricted by the material of a substrate. <P>SOLUTION: A polarization diffraction grating 1 includes a transparent substrate 2, a polymer liquid crystal layer 4 that is adhered onto the transparent substrate 2 via an adhesive layer 3, and that has a first concave-convex structure 4a that diffracts incident light formed on a face opposite to the adhesive layer 3, and an optically isotropic material layer 5 provided to fill the first concave-convex structure 4a. A second concave-convex structure made up of a plurality of stripe grooves 22 disposed parallel to each other is further formed on the face of the polymer liquid crystal layer 4 on which the first concave-convex structure 4a is formed, and liquid crystal molecules in the polymer liquid crystal layer 4 are oriented in the groove lengthwise direction (the lengthwise direction of the stripe grooves 22) of the second concave-convex structure. <P>COPYRIGHT: (C)2011,JPO&INPIT |
