| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarizer small in wavelength dependency, suitable for miniaturization and excellent in optical characteristics such as insertion loss by specifying the interval between layers of a metallic particle and the distribution density of the metallic particles existing on the same layer. SOLUTION: This polarizer is provided with a transparent substrate 2 consisting of transparent material such as glass, etc., a transparent dielectric layer (polarization layer) 3 consisting of the transparent material such as glass diffusing the metallic particles 4a onto plural layers, a layer of transparent dielectric layer 3a and a diffused metallic particle part 4 diffusing a piece of metallic particle 4a of a rotary elliptic body shape. Then, the gap of the metallic particle 4a, that is, the thickness of a layer of transparent dielectric layer 3a is made 50 nm or above, preferably 100 nm or above, and the distribution density of the metallic particles 4a existing on the same layer in the diffused metallic particle part 4 is made 3-37 pieces/μm<2> . This distribution density is measured so that the diffused metallic particle part 4 is cut off by a plane containing the major axis of at least a piece of metallic particle 4a and parallel to the diffused metallic particle part 4, and the number of pieces of the metallic particles 4a in its surface are counted. |
