Abstract
The interference contrast in a near-field diffraction pattern can be improved using an asymmetric grating with a small grating window. However, commercial asymmetrically shaped gratings are not available. Here, we report a method that overlaps two gratings to produce an arbitrary open fraction in the combination grating. Both theoretical simulation and experimental observations of the near-field Talbot effect are provided to validate this concept. A characterization of optical vortices is also used as a demonstration of potential applications. This method is simple and can improve the resolution in metrology with optical sensors.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Saifollah Rasouli, Pouria Amiri, and Davud Hebri
Opt. Express 31(13) 20683-20695 (2023)
Pouria Amiri, Ali Mardan Dezfouli, and Saifollah Rasouli
J. Opt. Soc. Am. B 37(9) 2668-2677 (2020)
Ruiyun Jiao, Lichao Dou, Wenqian Zhang, and Kaiyun Zhan
J. Opt. Soc. Am. B 38(1) 123-128 (2021)