Near field diffraction of cylindrical convex gratings



Downloads per month over past year

Torcal Milla, Francisco José and Sánchez Brea, Luis Miguel and Bernabeu Martínez, Eusebio (2015) Near field diffraction of cylindrical convex gratings. Journal of optics, 17 (3). ISSN 2040-8978

[thumbnail of Bernabeu,E05 postprint+embargo03_16.pdf]

Official URL:


We analyze the field produced by a cylindrical convex diffraction grating at the Fresnel regime for several kinds of light sources, including a monochromatic quasipunctual source, finite size, and polychromatic sources. These results can help one understand the functioning of rotary optical encoder technology. A decrease in the self-image contrast is produced for finite nonpunctual sources. In addition, the polychromaticity of the source affects the smoothness of the self-images, making them quasicontinuous from a certain distance from the grating forward. Finally, we experimentally validate the obtained analytical predictions.

Item Type:Article
Additional Information:

© 2015 IOP Publishing Ltd. The authors thank Jose Maria Herrera-Fernandez for his help with graphics. This work has been supported by the project DPI2011-27851 of the Ministry of Science and Innovation of Spain and the project Fagor Automation-UCM Ref. 92/2014.

Uncontrolled Keywords:Rotary encoder
Subjects:Sciences > Physics > Optics
ID Code:35521
Deposited On:04 Feb 2016 13:00
Last Modified:01 Apr 2016 23:01

Origin of downloads

Repository Staff Only: item control page