We show that oscillating dark solitons exist on a stable continuous plane-wave background in a cavity with a saturable defocusing nonlinearity. These oscillations can be attributed to a linear internal mode of the soliton with a complex eigenvalue emerging above a definite input field intensity. Using a simple analytical model, we find that the self-oscillations appear as a consequence of an interaction between the center of the soliton and the surrounding ring.
© 1998 Optical Society of America
Dirk Michaelis, Ulf Peschel, and Falk Lederer, "Oscillating dark cavity solitons," Opt. Lett. 23, 1814-1816 (1998)