Anisotropic charge displacement supporting isolated photorefractive optical needles.
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.
Delre
E
E
Ciattoni
A
A
Agranat
A J
AJ