| 摘要 |
<p>An optical device comprising an arrangement of wavelength dependant optical phase modifying optical elements on a first surface of a substrate, each of the optical elements being configured to produce a local phase change to reflected and/or transmitted electromagnetic waves, the arrangement configured such that the combined action of each of the optical elements produces a pre-defined optical effect on reflection and/or transmission observable by a viewer when the arrangement is illuminated by an external electromagnetic source. 10 a El 7a 2 7b Figure 1a 7a 7b</p> |
