Focusing properties of cylindrical vector vortex beams

• Published in: Optics communications Vol. 414; pp. 10 - 15
• Main Authors: Xiaoqiang, Zhang, Ruishan, Chen, Anting, Wang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2018
• Subjects: Azimuthally polarization beam; Cylindrical vector beams; DOE; Objective; Optical vortices beams; Radially polarized beam; Cylindrical vector beams; Radially polarized beam; Objective; Optical vortices beams; 050.4865; 260.5430; DOE; Azimuthally polarization beam; 050.1960
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2017.12.076

In this paper, following Richards and Wolf vectorial diffraction theory, the focusing properties of cylindrical vector vortex beams (CVVB) are investigated, and a diffractive optical element (DOE) is designed to spatially modulate the amplitude of the CVVB. Simulated results show that the CVVB focused by an objective also carry orbital angular momentum (OAM), and the optical fields near the focal region can be modulated by changing the topological charge of the CVVB. We numerically simulate the focus properties of radially and azimuthally polarized beams with topological charge equal to 0, 1, 2 and 10 respectively. As a result, a dark channel with a length about 20 λ can be obtained. These new properties have the potential applications such as particle acceleration, optical trapping and material processing.