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Ultralong pure longitudinal magnetization needle induced by annular vortex binary optics

journal contribution
posted on 2024-11-02, 00:18 authored by Sicong Wang, Xiangping Li, Jianying Zhou, Min GuMin Gu
In this Letter, based on the Richards and Wolf diffraction theory, an ultralong optical needle with pure transverse polarization is numerically generated by tightly focusing an azimuthally polarized beam through an annular vortex binary filter. Such an ultralong transversely polarized optical needle is generated through the π phase shift between adjacent rings of the binary filter. We show that such a pure transverse optical needle can induce pure longitudinal magnetization with a subwavelength lateral size (0.38λ) and an ultralong longitudinal depth (7.48λ) through the inverse Faraday effect. The corresponding needle aspect ratio of 20 is twice as large as that of the longitudinal magnetization needle generated by electron beam lithography.

History

Journal

Optics Letters

Volume

39

Issue

17

Start page

5022

End page

5025

Total pages

4

Publisher

Optical Society of America

Place published

United States

Language

English

Copyright

© 2014 Optical Society of America.

Former Identifier

2006057958

Esploro creation date

2020-06-22

Fedora creation date

2016-01-14