P. Hansinger, G. Maleshkov, N. Gorunski, N. Dimitrov, A. Dreischuh, and G. G. Paulus
In this work we numerically study the evolution and interaction of one-dimensional (1-D) dark spatial solitons and semi-infinite dark stripes (SIDSs) in a local self-defocusing Kerr nonlinear medium. The experimental results in the linear regime of propagation confirm that the SIDS bending and fusion with the infinite 1-D dark beam modeled for negative nonlinearity is due to the opposite phase semi-helicities of SID beam ends. Results for several interaction scenaria show that bending ends of the semi-infinite dark stripes splice to the 1-D dark beam to form structures resembling waveguide couplers/branchers. Well pronounced modulational stability of 1-D dark spatial solitons under strong symmetric background beam modulation from decaying SIDSs is predicted.
Keywords: Kerr nonlinearity, self-defocusing, phase dislocation, dark spatial soliton, semi-infinite dark beam, all-optical interaction, all-optical guiding