Strong asymmetry in the charge distribution supporting a single noninteracting spatial needle soliton in a paraelectric photorefractive is directly observed by means of electroholographic readout. Whereas in trapping conditions a quasi-circular wave is supported, the underlying double-dipolar structure can be made to support two distinct propagation modes.
© 2001 Optical Society of America
Eugenio DelRe, Alessandro Ciattoni, and Aharon J. Agranat, "Anisotropic charge displacement supporting isolated photorefractive optical needles," Opt. Lett. 26, 908-910 (2001)