| 摘要 |
PCT No. PCT/GB96/03016 Sec. 371 Date Jun. 9, 1998 Sec. 102(e) Date Jun. 9, 1998 PCT Filed Dec. 6, 1996 PCT Pub. No. WO97/21121 PCT Pub. Date Jun. 12, 1997A diffractive structure (100) has a substantially planar substrate (1). A set of facets (2) is formed in or on said substrate (1), the plane or planes in which the facets (2) lie being arranged at a non-zero angle to the plane of the substrate (1). Each facet (2) has a diffraction grating (5) formed thereon. The diffractive structure (100) will produce color over a wide range of viewing and illumination angles. |
