Generation of needle of longitudinally polarized beam by tight focusing of double-ring-shaped radially polarized beam with high NA lens axicon

被引：1
作者：
Anbarasan, P. M. [1 ]
Rajesh, K. B. [2 ]
机构：
[1] Periyar Univ, Dept Phys, Salem 636011, India
[2] Anna Univ, Dept Phys, Tirunelveli 627027, Tamil Nadu, India
来源：
LIGHT AT EXTREME INTENSITIES: OPPORTUNITIES AND TECHNOLOGICAL ISSUES OF THE EXTREME LIGHT INFRASTRUCTURE | 2010年 / 1228卷
关键词：
DIVERGING ABERRATED LENS; LASER-BEAMS; 2ND-HARMONIC GENERATION; FOCAL SPOT; FIELD; SYSTEMS; DEPTH; LIGHT; ACCELERATOR; DIFFRACTION;
D O I：
10.1063/1.3426072
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A method is presented for generation of a sub wavelength (0.25 lambda) longitudinally polarized beam, which propagates without divergence over lengths of about 3 lambda in free space. This is achieved by tight focusing of double ring shaped radially polarized beam with a high NA lens axicon that utilizes spherical aberration to duplicate the performance of an axicon and to create an extended focal line. The intensity distributions were calculated based on Vector diffraction theory and it was observed that in the case of high Numerical Aperture (NA) lens axicon, the distribution of the total intensity near the focus has little effect with the degree of truncation of the incident beam by the pupil.
引用
收藏
页码：338 / +
页数：4
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