连续激光诱导金纳米棒荧光增强效应  

Continuous Laser Induced Photoluminescence Enhancement of Au Nanorods

作　　者：张文学[1,2] 张晓荣 秦成兵 肖连团[1,2] Zhang Wenxue;Zhang Xiaorong;Qin Chengbing;Xiao Liantuan(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan,Shanxi 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,Shanxi 030006,China)

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006

出　　处：《激光与光电子学进展》2019年第20期139-147,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金（61875109,61675119,11504216,61605104）;山西“1331工程”重点学科;山西省高等学校科技创新项目（201802019)

摘　　要：为了解决光学检测中金纳米棒荧光发射强度微弱的问题,通过连续激光照射,加强了金纳米棒局域表面等离子体共振效应,实现了对团聚金纳米棒荧光强度近两个量级的提高,同时具有实时调节金纳米颗粒荧光强度的优势。本文研究了荧光增强效应随激光波长、照射功率密度、金纳米棒长径比与比表面积的变化关系。结果表明,比表面积小的金纳米棒荧光增强效果更好;对于同一种金纳米棒,通过优化照射功率密度,选择与金纳米棒横向等离子体峰共振的波长进行照射可以获得更好的增强效果。To address the problem of the weak photoluminescence(PL)intensity of Au nanorods in optical detection,the PL intensity of Au rods is increased by more than two orders of magnitude via continuous wave laser irradiation based on the enhancement of localized surface plasma resonance,and the PL intensity is adjusted in real time.The variation in PL enhancement with the wavelength,power density of the irradiation laser,and the aspect ratio and surface-to-volume ratio(SVR)of Au nanorods is investigated.Experimental results indicate that Au nanorods with small SVR exhibit better improvement.For certain Au nanorods,this enhancement can be further improved by optimizing laser power density and wavelength that is resonant with the transverse plasma mode of Au nanorods.These results will guide the enhancement of the PL intensity of Au nanorods.

关 键 词：表面光学 光电子学 金纳米棒 荧光 激光照射 局域表面等离子体共振 

分 类 号：O436[机械工程—光学工程]