Abstract
Based on extended Richards–Wolf theory for axisymmetric surfaces and the inverse Faraday effect, we propose the generation of a purely longitudinal magnetization needle by focusing Gaussian annular azimuthally polarized beams with a spherical mirror. The needle obtained has a longitudinal length varying hundreds to thousands of wavelengths while keeping the lateral size under , and the corresponding aspect ratio can easily reach more than 2000. It may be the first time that a magnetization needle whose aspect ratio is over 500 has been achieved. The approximate analytical expressions of the magnetization needle are given, and the longitudinal length is tunable by changing the value of the angular thickness and the position of the annular beams.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Weichao Yan, Zhongquan Nie, Xueru Zhang, Yuxiao Wang, and Yinglin Song
Appl. Opt. 56(7) 1940-1946 (2017)
Weichao Yan, Zhongquan Nie, Xueru Zhang, Yuxiao Wang, and Yinglin Song
Opt. Express 25(19) 22268-22279 (2017)
Zhongquan Nie, Zibo Ning, Xiaofei Liu, Yu Zhang, Hengjing Wang, Ensi Cao, and Weichao Yan
Opt. Express 31(12) 19089-19101 (2023)