Abstract
Optical vortex has attracted much interest re-cently due to its novel properties and applica-tions. In this paper, the focusing properties of Gaussian beam containing one non-spiral opti-cal vortex are investigated by means of scalar diffraction theory. Simulation results show that topological charge of non-spiral optical vortex affects optical intensity distribution in focal re-gion considerably, and non-spiral focal pattern may also occur. Multiple intensity peaks may appear companying with center main focal spot under condition of higher topological charge. In addition, the number of weak intensity peak outside of the center main intensity peak is re-lated to the value of topological charge.
Highlights
Singular optics studying optical vortex has grown rapidly recently because optical vortex has some interesting properties [1,2,3,4,5] and promising applications [6,7,8]
The present paper is aimed at studying focusing properties of Gaussian beam containing one non-spiral optical vortex are investigated by scalar diffraction theory
The focusing properties of Gaussian beam containing one non-spiral optical vortex are investigated by scalar diffraction theory in this paper
Summary
Singular optics studying optical vortex has grown rapidly recently because optical vortex has some interesting properties [1,2,3,4,5] and promising applications [6,7,8]. In the focal reign of focusing beam that contains optical vortex, the optical momentum can be transferred to micro-particle, namely, light energy can be transformed directly to dynamic energy of particle, which has been used to construct experimentally microscopic optical rotator. Non-spiral optical vortex may own more interesting properties due to more flexible vortex pattern. The present paper is aimed at studying focusing properties of Gaussian beam containing one non-spiral optical vortex are investigated by scalar diffraction theory.
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