Composite optical vortices may form when two or more beams interfere. Using analytical and numerical techniques, we describe the motion of these optical phase singularities as the relative phase or amplitude of two interfering collinear nonconcentric beams is varied. The creation and the annihilation of vortices are found, as well as vortices having translational velocities exceeding the speed of light.
© 2003 Optical Society of America
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.6140) Coherence and statistical optics : Speckle
(260.0260) Physical optics : Physical optics
(260.3160) Physical optics : Interference
(350.5030) Other areas of optics : Phase
Ivan D. Maleev and Grover A. Swartzlander, Jr., "Composite optical vortices," J. Opt. Soc. Am. B 20, 1169-1176 (2003)