Imaging Components, Systems, and Processing

Axial multifocal binary-phase zone plate for high numerical aperture focusing

[+] Author Affiliations
Zhenxian Huang, Zhiqiang Hao

Tianjin University of Commerce, College of Science, 409, Guangrong Road, Beichen District, Tianjin 300134, China

Linwei Zhu

Ludong University, School of Physics and Optoelectronic Engineering, 186, Middle Hongqi Road, Zhifu District, Yantai, Shandong Province 264025, China

Opt. Eng. 55(12), 123101 (Dec 05, 2016). doi:10.1117/1.OE.55.12.123101
History: Received September 13, 2016; Accepted November 15, 2016
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Abstract.  Binary-phase zone plates (BPZPs) are proposed for generating two foci along the optical axis of a high numerical aperture objective. The radii of BPZPs are given by an analytical expression, in which the axial shifting distance of two foci is included. By changing the axial shifting distance, a set of BPZPs can be designed for achieving tunable two foci in the optical axial direction of the objective. Theoretical analysis and simulation results prove that the tunable axial two foci can be realized successfully, and furthermore, the intensity distribution of focal spots with special shapes (optical needle and optical bubble) can also be created by using BPZPs with suitable axial shifting distance. In addition, axial multifocal spots array can also be realized by superposition of multiple BPZPs with different axial shifting distances.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Zhenxian Huang ; Zhiqiang Hao and Linwei Zhu
"Axial multifocal binary-phase zone plate for high numerical aperture focusing", Opt. Eng. 55(12), 123101 (Dec 05, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.123101


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