Tunable focal shift induced by polarization and phase shaping

Journal article (2019)

Authors

Shuoshuo Zhang Shandong University of Technology, Zibo
Zhidong Bai Shandong University of Technology, Zibo
Jinjian Li Shandong University of Technology, Zibo
Yudong Lyu Shandong University of Technology, Zibo
Z. Man ImPhys/Optics - AS , Shandong University
Fei Xing Shandong University of Technology, Zibo
Xiaolu Ge Shandong University of Technology, Zibo
Shenggui Fu Shandong University of Technology, Zibo
Research Group
ImPhys/Optics (AS) (TU Delft)
Polarization Diffractive optics Focal shift Singular optics
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Optics

Abstract

We propose a simple method to control the move and elongation of focus along the optical axis in a high-numerical aperture focusing system. By introducing the optical degree of freedom of polarization in the radial direction, a tunable focal shift and elongation of focus are achieved simply by tailoring the polarization index and the topological charge of vortex phase, without the need of additional modulations of amplitude or diffractive optical elements. These findings may be of help in the applications like optical micro-manipulation, laser processing, and imaging.