Multipole-mode solitons in Bessel optical lattices
  We study basic properties of quiescent and rotating multipole-mode solitons supported by axially symmetric Bessel lattices in a medium with defocusing cubic nonlinearity. The solitons can be found in different rings of the lattice and are stable when the propagation constant exceeds the critical value, provided that the lattice is deep enough. In a high-power limit the multipole-mode solitons feature a multi-ring structure. 
Yaroslav V. Kartashov, R. Carretero-Gonzalez, Boris A. Malomed, Victor   A. Vysloukh, and Lluis Torner