With micro-structured vertical cavity surface emission semiconductors (VCSEL), lasing on extremely higher-order whispering-gallery modes, dynamical chaotic modes, superposition of periodic-orbit and non-periodic orbitals, linear and nonlinear surface modes, and crescent waves are demonstrated in experiments and simulations. To have wave localized, the delicate balance of linear and nonlinear effects sustain self-localized solitary waves. However, their observation requires a threshold power that in many cases is not accessible. A challenge is finding mechanisms to reduce this threshold, and the use of optimized geometrical constraints looks a promising strategy. Here we experimentally demonstrate a thresholdless nonlinear localized wave pinned to the boundary of a curvature, in an elliptical-ring potential without any extra formation power. The corresponding lasing characteristics including near/far field and dispersion-relation measurements verify the localization of nonlinear waves.? ?The introduction of curved manifolds opens a new generation for nonlinear optical systems and laser devices wit a vanishing power threshold.? ?Moreover,? ?related work on the? ?analog of parity-time symmetry Hamiltonian, the? ?realization of optical compass states (superposition of four coherents) and quantum invisible cloaks based on scattering cancellation will also? ?be introduced in this talk.