Open AccessContinuous manipulation of doughnut focal spot in a large scale
Author(s) -
Xiang Hao,
Cuifang Kuang,
Yanghui Li,
Xu Liu
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.012692
Subject(s) - optics , spatial light modulator , phase modulation , modulation (music) , optical tweezers , interferometry , spatial frequency , image resolution , phase (matter) , flexibility (engineering) , physics , phase noise , acoustics , mathematics , quantum mechanics , statistics
We theoretically demonstrate that the doughnut focal spot can continuously be manipulated by synthetically using various beam modulation techniques. Comparatively, a more evident effect can be expected by different orders of phase modulation, while accurate manipulation stems from changing the phase diversity between two arms in an image inverting interferometer (III). The size of central dark spot can thus be continuously adjusted in a theoretically infinite scale, although it may actually be limited by resolution of Spatial Light Modulator (SLM). This approach brings additional flexibility to many applications, such as optical tweezers.