Conical diffraction of linearly polarised light controls the angular position of a microscopic object

被引：30

作者：

O'Dwyer, D. P. ^{[1
]}

Phelan, C. F. ^{[1
]}

Ballantine, K. E. ^{[1
]}

Rakovich, Y. P. ^{[1
]}

Lunney, J. G. ^{[1
]}

Donegan, J. F. ^{[1
,2
]}

机构：

[1] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

[2] Trinity Coll Dublin, CRANN Res Inst, Dublin 2, Ireland

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 26期

基金：

爱尔兰科学基金会;

关键词：

DNA; ROTATION; FORCES;

D O I：

10.1364/OE.18.027319

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Conical diffraction of linearly polarised light in a biaxial crystal produces a beam with a crescent-shaped intensity profile. Rotation of the plane of polarisation produces the unique effect of spatially moving the crescent-shaped beam around a ring. We use this effect to trap microspheres and white blood cells and to position them at any angular position on the ring. Continuous motion around the circle is also demonstrated. This crescent beam does not require an interferometeric arrangement to form it, nor does it carry optical angular momentum. The ability to spatially locate a beam and an associated trapped object simply by varying the polarisation of light suggests that this optical process should find application in the manipulation and actuation of micro- and nano-scale physical and biological objects. (C) 2010 Optical Society of America

引用

页码：27319 / 27326

页数：8