Tunable binary Fresnel zone plates using a digital micromirror device

  • Miguel Revilla National Institute of Physics, University of the Philippines Diliman
  • Katherine Isabel Remulla National Institute of Physics, University of the Philippines Diliman
  • Nathaniel Hermosa National Institute of Physics, University of the Philippines Diliman

Abstract

Fresnel zone plates use interference from alternating concentric opaque and transparent regions to focus light. In this study, we tailored Fresnel zone plates (FZP) to focus a beam with a wavelength of 633 nm at distances of 10, 15, and 20 cm from the zone plate. To allow for fast, on-demand focusing, the plates were uploaded to a digital micromirror device (DMD). With the FZPs, the light was observed to focus at 10, 16.5, and 23.5 cm, varying by 10% - 18% from prediction. The beam waists at the focus were measured and differed by four times from the theoretical. Nevertheless, FZPs allow for ``"lenses" with easily modifiable focal lengths.

Published
2019-05-22
How to Cite
[1]
M. Revilla, K. I. Remulla, and N. Hermosa. Tunable binary Fresnel zone plates using a digital micromirror device, Proceedings of the Samahang Pisika ng Pilipinas 37, SPP-2019-PA-46 (2019). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2019-PA-46.