Ultrasolitons: Multistability and subcritical power threshold from higher-order Kerr terms
Centro de Láseres Pulsados Ultracortos Ultraintensos (CLPU) - Plaza de la Merced s/n, Salamanca, ES-37008 Spain, EU
2 Departamento de Física Aplicada, Universidade de Vigo - As Lagoas s/n, Ourense, ES-32004 Spain, EU
Accepted: 17 April 2012
We show that an optical system involving competing higher-order Kerr nonlinearities can support the existence of ultrasolitons, namely extremely localized modes that only appear above a certain threshold for the central intensity. Such new solitary waves can be produced for powers below the usual collapse threshold, but they can also coexist with ordinary, lower-intensity solitons. We derive analytical conditions for the occurrence of multistability and analyze the dynamics of the different kinds of fundamental eigenmodes that can be excited in these nonlinear systems. We also discuss the possible transitions between solitary waves belonging to different nonlinear regimes through the mechanism of soliton switching.
PACS: 42.65.Tg – Optical solitons; nonlinear guided waves / 42.65.Jx – Beam trapping, self-focusing and defocusing; self-phase modulation / 42.65.Pc – Optical bistability, multistability, and switching, including local field effects
© EPLA, 2012