SPASER nanoparticle(NP),with small size,ultranarrow spectral-line and good biocompatibility,is a potential biomedical nanoprobe.However,owning to the striking light absorption capacity of Au-resonator,huge energy could accumulate under strong pump-ing-laser,which would lead to poor photo-stability and unexpected photo-damage to SPASER NP,and is harmful to its future practical application but hasn't been systematically studied in experiment.In this paper,our experimental and theoretical researches revealed that the photo-stability of SPASER NP is largely determined by its structure parameters:smaller Au-core diameter,thicker silica-shell will contribute to better photo-stability.And the possibility and extent of photo-damage of SPASER NP depend on not only its intrin-sic stability but also the external pumping-laser.Notably,the strong pumping condition for two-level SPASER system could lead to heating-melting-evaporation or even phase-explosion of SPASER NP,resulting in obvious photo-damage,while,the weak pumping condition for three-level SPASER system is quite friendly.This study provides reliable bases for the structural-properties optimization of SPASER NPs,which is of great significance for its future application as a novel luminescence probe.

Jian-Hua Wang;Shao-Peng Wang;Pavel N.Melentiev;Bin Kang;Jing-Juan Xu;Hong-Yuan Chen

State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,Jiangsu 210023,China;Institute of Spectroscopy of the Russian Academy of Sciences,Troitsk,Moscow 108840,Russia

中国化学（英文版）

[1]Jian-Hua Wang;Shao-Peng Wang;Pavel N.Melentiev;Bin Kang;Jing-Juan Xu;Hong-Yuan Chen-.Photo-stability and Photo-damage of SPASER Nanoparticles under Nanosecond Pulsed-laser)[J].中国化学（英文版）,2022(04):507-514

SPASER

Photo,stability,damage,Nanoparticles,under,Nanosecond,Pulsed,laser,nanoparticle,size,ultranarrow,spectral,line,good,biocompatibility,potential,biomedical,nanoprobe,However,owning,striking,light,absorption,capacity,Au,resonator,huge,energy,could,accumulate,strong,which,would,lead,poor,photo,unexpected,harmful,its,future,practical,application,hasn,been,systematically,studied,In,this,paper,our,experimental,theoretical,researches,revealed,that,largely,determined,by,structure,parameters,smaller,core,diameter,thicker,silica,shell,will,contribute,better,And,possibility,extent,depend,not,only,intrin,sic,also,external,pumping,Notably,condition,two,level,heating,melting,evaporation,even,phase,explosion,resulting,obvious,while,weak,three,quite,friendly,This,study,provides,reliable,bases,structural,properties,optimization,NPs,great,significance,novel,luminescence

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