Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1538116 | Optics Communications | 2010 | 5 Pages |
Abstract
We analyze the near field behavior of binary amplitude gratings which present a curved profile. This configuration has an important application in rotary optical encoders. This kind of encoders is used to measure the angular displacement between two different parts of the devices. To our knowledge, its behavior in the near field has not been analyzed yet. We have found that Talbot effect is produced but the period of the self-images and Talbot distances change as we separate from the grating. We have fabricated a curved grating and have performed the experiment to corroborate the behavior theoretically found. This fact could be useful in systems that use Talbot effect to measure displacements, since the mechanical tolerances grow.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Francisco Jose Torcal-Milla, Luis Miguel Sanchez-Brea, Francisco Javier Salgado-Remacha, Eusebio Bernabeu,