Multifocal spot array generated by fractional Talbot effect phase-only modulation

被引:38
作者
Zhu, Linwei [1 ]
Yu, Junjie [2 ]
Zhang, Dawei [3 ]
Sun, Meiyu [1 ]
Chen, Jiannong [1 ]
机构
[1] Ludong Univ, Sch Phys & Optoelect Engn, Yantai 264025, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Lab Informat Opt & Optoelect Technol, Shanghai 201800, Peoples R China
[3] Shanghai Univ Sci & Technol, Sch Opt Elect & Comp Engn, Shanghai Key Lab Modern Opt Syst, Engn Res Ctr Opt Instrument & Syst,Minist Educ, Shanghai 200093, Peoples R China
来源
OPTICS EXPRESS | 2014年 / 22卷 / 08期
基金
中国国家自然科学基金;
关键词
SPATIAL LIGHT-MODULATOR; POLARIZED VORTEX BEAMS; BESSEL-GAUSS BEAMS; MULTIPHOTON MICROSCOPY; OPTICAL TWEEZERS; DIFFRACTION; EQUATIONS; GRATINGS; SYSTEMS; IMAGE;
D O I
10.1364/OE.22.009798
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose an approach for generating a multifocal spot array (MSA) with a high numerical aperture (NA) objective. The MSA is generated by using a special designed phase-only modulation at the back aperture of an objective. Without using any iteration algorithm, the modulated phase pattern is directly obtained by the simple analytical expressions based on the fractional Talbot effect. It is shown that the number of the spots in the focal region depends solely on the fractional Talbot parameter. By engineering the phase pattern with a large fractional Talbot parameter, a large number of focal spots can be created. Furthermore, the intensity distribution of each focal spot can be manipulated by introducing a composite spatially shifted vortex beam (CSSVB) as the incident field, leading to creation of various kinds of specific shaped spots. Consequently, the MSA composed of multiple individual spots with specific shape is created by focusing the CSSVB combined with the multifocal phase-only modulation. These kinds of MSAs may be found applications in parallel optical micromanipulation, multifocal multiphoton microscopic imaging, and parallel laser printing nanofabrication. (C) 2014 Optical Society of America
引用
收藏
页码:9798 / 9808
页数:11
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