Dramatic changes of optical nonlinearity and ultrafast dynamics of palladium nanoparticles caused by hydriding

- The self focusing of Pd NPs increases with the hydriding.
- The nonlinear absorption of Pd NPs changes from SA to RSA with the hydriding.
- The acoustic breathing movement of Pd NPs damps obviously with the hydriding.
- The contact between the NPs and the substrate becomes loose with the hydriding.