Super-long longitudinal magnetization needle generated by focusing an azimuthally polarized and phase-modulated beam

Wangzi Ma; Dawei Zhang; Linwei Zhu; Jiannong Chen

doi:10.3788/COL201513.052101

Journals >Chinese Optics Letters >Volume 13 >Issue 5 >Page 052101 > Article

Chinese Optics Letters
Vol. 13, Issue 5, 052101 (2015)

Super-long longitudinal magnetization needle generated by focusing an azimuthally polarized and phase-modulated beam

Wangzi Ma¹, Dawei Zhang², Linwei Zhu¹, and Jiannong Chen^1、*

Author Affiliations

¹School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China

²Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Lab of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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DOI: 10.3788/COL201513.052101 Cite this Article Set citation alerts

Wangzi Ma, Dawei Zhang, Linwei Zhu, Jiannong Chen. Super-long longitudinal magnetization needle generated by focusing an azimuthally polarized and phase-modulated beam[J]. Chinese Optics Letters, 2015, 13(5): 052101 Copy Citation Text

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Abstract

Based on the inverse Faraday effect, a super-long longitudinal magnetization needle can be induced by a transversely polarized needle-shaped electric field. This needle-shaped electric field can be obtained in the focal volume of the objective by focusing an azimuthally polarized vortex beam that is modulated both radially and azimuthally by a specifically designed annular phase filter. The numerical calculation shows that the full widths at half-maximums in longitudinal direction and in transverse direction of the magnetization needle are

28 λ

and

0.27 λ

. The corresponding needle aspect ratio of 103 is more than ten times larger than that of the magnetization needle fabricated by electron beam lithography.