Nonlinear Optics Quantum Optics, vol.56, no.3-4, pp.317-370, 2022 (ESCI)
© 2022 Old City Publishing, Inc.This paper recovers solitons with optical metamaterials in nonlinear directional couplers. Both twin–core and multiple–core couplers are considered. There are six nonlinear forms of refractive index studied. The sine–Gordon equation approach is the adopted integration scheme in the work.