Synopsis The nonlinear dynamics in two-leg ladder system subject to an artificial magnetic field are discussed in detail. The critical conditions for the formation of soliton and for the transition from diffusion to self-trapping are presented, and confirmed by the numerical simulations of the full discrete nonlinear Schrödinger equation.

Synopsis The programmable plasma structure generated by the laser-plasma interaction is discussed theoretically. The multiple plasma density distribution patterns which includes single channel, double channel and slow-wave plasma structure is achieved by modulating the ponderomotive force controlled by the laser’s beam profile and pulse width.

Synopsis The radiation force of the terahertz field is realized and highly modulated by changing the spatial distribution of the THz field, which is controlled by the coupling effects of the laser field, external magnetic field, and self-generated plasma channel. Moreover, the stability of the terahertz radiation is also discussed.