Helico-conical optical beams:: a product of helical and conical phase fronts

被引：123
作者：
Alonzo, CA [1 ]
Rodrigo, PJ
Glückstad, J
机构：
[1] Univ Philippines, Natl Inst Phys, Quezon City 1101, Philippines
[2] Riso Natl Lab, Opt & Plasma Res Dept, DK-4000 Roskilde, Denmark
来源：
OPTICS EXPRESS | 2005年 / 13卷 / 05期
关键词：
D O I：
10.1364/OPEX.13.001749
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator (SLM) by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence. The intensity distributions of the focused beams are explored in two- and three-dimensions. In contrast to the ring shape formed by a focused optical vortex, a helico-conical beam produces a spiral intensity distribution at the focal plane. Simple scaling relationships are found between observed spiral geometry and initial phase distributions. Observations near the focal plane further reveal a cork-screw intensity distribution around the propagation axis. These light distributions, and variations upon them, may find use for optical trapping and manipulation of mesoscopic particles. (C) 2005 Optical Society of America.
引用
收藏
页码：1749 / 1760
页数：12
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