Abstract

We proposed a type of tightly autofocusing beams (TABs) to create and enhance longitudinally polarized fields with subdiffraction beam sizes. It reveals that the TABs can automatically focus and behave with similar focusing properties to those with a high numerical aperture lens; a radially polarized beam generates a strong longitudinal field, while the azimuthally polarized one cannot. By reducing the order of the TAB, the maximum conversion efficiency of light to longitudinal field is as high as 98.32% in theory. As such, we demonstrate that the spin-to-orbital angular momentum conversion is also enhanced by circularly polarized TABs.

© 2020 Optical Society of America

Mathieu and Weber tightly autofocusing beams

Zhaojin Guo, Sheng Liu, Peng Li, Bingyan Wei, and Jianlin Zhao
Opt. Express 31(11) 17345-17353 (2023)

Tightly focused light field with controllable pure transverse polarization state at the focus

Lei Han, Shuxia Qi, Sheng Liu, Huachao Cheng, Peng Li, and Jianlin Zhao
Opt. Lett. 45(21) 6034-6037 (2020)

Abrupt polarization transition of vector autofocusing Airy beams

Sheng Liu, Meirong Wang, Peng Li, Peng Zhang, and Jianlin Zhao
Opt. Lett. 38(14) 2416-2418 (2013)

Tightly autofocusing beams along the spherical surface

Zhaojin Guo, Sheng Liu, Peng Li, Bingyan Wei, and Jianlin Zhao
Opt. Express 30(15) 26192-26200 (2022)

Laser nanoprocessing via an enhanced longitudinal electric field of a radially polarized beam

Yukine Tsuru, Yuichi Kozawa, Yuuki Uesugi, and Shunichi Sato
Opt. Lett. 49(6) 1405-1408 (2024)