Abstract
We propose a new diffractive optical element, called a spiral Dammann zone plate (SDZP), to generate a series of dipole vortices along the optical axis in the focal region of a focusing objective. By combining this SDZP and another Dammann grating, we describe the generation of three-dimensional dipole vortex arrays in the focal volume of an objective. For experimental demonstration, a SDZP with base charge of is fabricated by using lithography and wet-etching techniques, and a coaxial dipole vortex array is achieved for an objective of . Furthermore, by combining the SDZP and another Dammann grating, a dipole vortex array is also experimentally demonstrated. The results show that topological charges of these vortex arrays on five coaxial planes could be tunable by selecting a vortex beam carrying different charge as the incident field.
© 2012 Optical Society of America
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