Bright Solitons In An Optical Lattice Induced In Nonlocal Media With Infinite Range Of Nonlocality

We investigate the propagation of a spatial soliton in an optical lattice imprinted in a nonlocal thermal media with infinite range of nonlocality. A variational approach is used to obtain dynamical equation for beam width, amplitude and curvature. Furthermore an approximate formula to form a quasi-soliton is obtained. What implying that Gaussian function is a good approximation to a nonlocal spatial soliton in such thermal media with lattices when the lattice period is larger. Numerical simulations show the dynamic propagation of the quasi-solitons.