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Proceedings Paper

Axial multifocal spots generated by sectored phase-only modulation under tight focusing condition
Author(s): Linwei Zhu; Shengzhe Ji; Lili Wang; Meiyu Sun; Zhigang Li; Junjie Yu; Jiannong Chen
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Paper Abstract

We propose a method for generating axial multifocal spots (AMS) with a high numerical aperture (NA) objective. The AMS is generated by using phase-only modulation at the back aperture of the objective. Without using any iteration algorithm, the modulated phase distribution is directly calculated by an additional phase analytical formula with different focal distances. By dividing the back aperture of the objective into multi sectorial zones and applying the corresponding additional phase with different focal distances, the AMS can be created. Numerical simulation shows that the numbers of the axial focus depends solely on the different phase distribution calculated by different focal distances. By engineering the phase pattern with different focal distances, axial multifocal spots with different spacing can be realized. Furthermore, combined with vortex phase, the AMS with specific shape spots also can be created. In addition, the AMS focused by incident beams of circular polarization, radial polarization and angular polarization are also studied. This kind of AMS may be found applications in optical imaging, especially in three-dimensional (3D) biological imaging, and also be attractive in mult-plane optical trapping.

Paper Details

Date Published: 11 November 2014
PDF: 10 pages
Proc. SPIE 9271, Holography, Diffractive Optics, and Applications VI, 92710L (11 November 2014); doi: 10.1117/12.2071243
Show Author Affiliations
Linwei Zhu, Ludong Univ. (China)
Shengzhe Ji, Ludong Univ. (China)
Lili Wang, Ludong Univ. (China)
Meiyu Sun, Ludong Univ. (China)
Zhigang Li, Ludong Univ. (China)
Junjie Yu, Shanghai Institute of Optics and Fine Mechanics (China)
Jiannong Chen, Ludong Univ. (China)


Published in SPIE Proceedings Vol. 9271:
Holography, Diffractive Optics, and Applications VI
Yunlong Sheng; Chongxiu Yu; Changhe Zhou, Editor(s)

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