| Owing to the unique optical linearity and nonlinearity properties,nanocomposites embedded metal nanoparticles(NPs)show broad application prospects in ultra-fast optical switch,optical information storage,optical communication,optical sensing,optical waveguide and other fields.Among the various synthesis technologies of the nanocomposites,ion implantation has attracted more and more attention due to its advantages of controllable energy and adjustable dose.In this paper,the synthesis,structures and optical properties of NPs induced by Zn and Ag ion singly or sequentially implanted Nd:YAG and Nd:GGG crystal materials were studied.The main research contents and results are given as follows:(1)We fabricated the Ag NPs/Nd:YAG nanocomposites by Zn and/or Ag ions singly or sequentially implanted Nd:YAG crystal.Among,the Zn ions with energy of 70 ke V at two different fluences of 3×1016 and 5×1016 cm-2,respectively,and the Ag ions with energy of 120 ke V at the fluence of 5×1016 cm-2.Accompanied with thermal annealing in a nitrogen atmosphere,the structures and optical properties of fabricated nanocomposites at the effect of pre-implanted Zn ions were investigated in detail.Our results clearly show that the Nd:YAG single crystal by sequential implantation of Zn and Ag ions displays a strong plasmon resonance absorption peak(SPR)at 468 nm,and the third-order nonlinear optical response significantly enhanced.Meanwhile,the linear and nonlinear optical properties of the dual-implanted samples exhibit an increased intensity with increasing Zn fluence.Besides,as for the Nd:YAG crystal sequentially implanted with Zn and Ag ions at the same fluence of 5×1016 cm-2,the large size and narrow distribution of Ag NPs and Ag-Zn co-solvent were synthesized.After subsequent 700?annealing,the Ag-Zn co-solvent disappeared and the Ag NPs have larger size,wider distribution and better crystal quality.Furthermore,the Zn and Ag ions sequentially implanted sample followed by 700?annealing displays the strongest SPR absorption peak and the largest third-order nonlinear susceptibility.Notably,the nonlinear absorption index of the Ag NPs/Nd:YAG nanocomposites is enhanced by nearly 7 orders of magnitude compared with the pure Nd:YAG crystal.(2)Combined with the results of the cross-sectional transmission electron microscopy(XTEM)and the Rutherford backscattering spectrometry/Channeling(RBS/C),we found that the amorphous phenomena appeared in the Nd:YAG crystal implanted with Ag ion and Zn/Ag ions.Meanwhile,we observed the epitaxial growth at the amorphous and crystal interface of Nd:YAG crystal implanted with Zn and Ag ions,and the thickness of amorphous layer decreased by?10 nm after annealing at700?.(3)The Nd:GGG crystal were pre-implanted with 70 ke V Zn ions at two different fluences of 3×1016 and 5×1016 cm-2,respectively,and then were subjected to implantation of 120 ke V Ag ions at the fluence of 5×1016 cm-2.The optical properties of fabricated nanocomposites were studied in detail.The results show that the dual-implanted sample with pre-implanted Zn ions at higher fluence exhibits enhanced SPR absorption and third-order nonlinear optical response compared to that in the Ag singly implanted sample.Moreover,the third-order nonlinear absorption coefficient of the sample displays an increased with increasing energy,indicating that the sample has saturation absorption effect.Besides,the sample exhibits significantly enhanced SPR absorption after annealing at 300?. |
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