Abstract

This paper explored the optically induced magnetization properties of radially polarized Bessel–Gaussian vortex beams with radial phase modulation in a ${{4}}\pi$ high numerical aperture (NA) focusing system, which is based on the vector diffraction theory and the inverse Faraday effect. The results show that in the case of radial modulation parameter $L = 0$, one longitudinal magnetization chain with adjustable length can be obtained by modulating the truncation parameter $\;\beta$. When the radial modulation parameter $L = 1.3$, two magnetization chains can be obtained by modulating the truncation parameter $\beta$. By modulating the radial modulation parameter $L$, two magnetization chains along the optical axis can be generated, each with four dark magnetic traps; meanwhile, the spacing between two magnetization chains can be adjusted. These results may be helpful in high-density all-optical magnetic recording, atom capture, and magnetic resonance microscopy.

© 2023 Optica Publishing Group

Spherical and sub-wavelength longitudinal magnetization generated by 4π tightly focusing radially polarized vortex beams

Zhongquan Nie, Weiqiang Ding, Dongyu Li, Xueru Zhang, Yuxiao Wang, and Yinglin Song
Opt. Express 23(2) 690-701 (2015)

Magnetization shaping generated by tight focusing of azimuthally polarized vortex multi-Gaussian beam

Weichao Yan, Zhongquan Nie, Xueru Zhang, Yuxiao Wang, and Yinglin Song
Appl. Opt. 56(7) 1940-1946 (2017)

Focusing properties of a polarization mixing quadratic space-variant phase-modulated sinh-Gaussian vortex beam

Jinsong Li, Haoran Zhang, Yueyang Chen, Shuo Chang, Yanfeng Su, and Xiumin Gao
J. Opt. Soc. Am. A 39(8) 1498-1504 (2022)

Achievement and steering of light-induced sub-wavelength longitudinal magnetization chain

Zhongquan Nie, Weiqiang Ding, Guang Shi, Dongyu Li, Xueru Zhang, Yuxiao Wang, and Yinglin Song
Opt. Express 23(16) 21296-21305 (2015)

Focusing pattern of the Laguerre–Gaussian beam with polarization mixing helical-conical phase modulation

Chenxu Lu, Jinsong Li, Haoran Zhang, Show Li, and Xiumin Gao
J. Opt. Soc. Am. A 40(7) 1303-1309 (2023)