All-optical logic gate based on manipulation of surface polaritons solitons via external gradient magnetic fields
Qi Liu, Na Li, Chaohua Tan
Abstract
We theoretically study the magneto-optical manipulation of surface polaritons (SPs) in the negative index metamaterial--dielectric interface waveguide system. We analyze the linear and nonlinear propagation properties of the system when a weak gradient magnetic field is applied. A lossless superluminal SPs soliton is obtained via active Raman gain. We show that the SPs soliton will deflect in the weak gradient magnetic field (Stern-Gerlach-like effect); thus, the trajectory of SPs can be controlled by the gradient magnetic field, and dynamic control of SPs can also be realized by using a time-dependent gradient magnetic field. In addition, a ``XNOR''-like logic gate is realized based on the trajectory control of SPs with external magnetic field and the interaction of the SPs soliton. This paper has certain theoretical significance for nanoscale optical information processing.