A four-quadrant phase filter for creating two focusing spots

被引：4

作者：

Chen, Jiannong ^{[1
]}

Xu, Qinfeng ^{[1
]}

Wang, Gang ^{[2
]}

机构：

[1] Ludong Univ, Sch Phys, Yantai 254024, Peoples R China

[2] Ludong Univ, Sch Elect & Elect Engn, Yantai 254024, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2012年 / 285卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Focusing; Radially polarized beam; Phase filter; ELECTROMAGNETIC DIFFRACTION; FLUORESCENCE MICROSCOPY; PHOTOTHERMAL THERAPY; RADIAL POLARIZATION; LONGITUDINAL-FIELD; OPTICAL SYSTEMS; DEPTH; EXCITATION; REGION; BEAMS;

D O I：

10.1016/j.optcom.2011.10.058

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a design method of four-quadrant pure phase filter and phase modulation functions for creating two focusing spots. With the combination of a high numerical aperture objective and a four-quadrant pure phase filter, a radially polarized incident plane wave can be focused into two focusing spots with the spacing of several wavelengths along the optical axis. The filter with the phase modulation functions are verified effective by numerical simulation. The distance of the two focuses and the position of each focus can be controlled and adjusted by changing the phase modulation functions. The beam quality and longitudinally polarization purity of these two focusing spots are calculated and discussed and thus the centrally obstructed four-quadrant phase filters are proposed to improve the beam quality. (C) 2011 Elsevier B.V. All rights reserved.

引用

下载

页码：900 / 904

页数：5

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