Surface enhanced fluorescence by porous alumina with nanohole arrays  

作　　者：ZHANG ZhengLong ZHENG HaiRong DONG Jun YAN XiaoQing SUN Yu XU HongXing 

机构地区：[1]College of Physics and Information Technology, Shaanxi Normal University, Xi＇an 710062, China [2]Beijing National Laborator/for Condensed ~Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第5期767-771,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities (Grant No.2010ZYGX025);the Innovation Funds of Graduate Programs,SNU (Grant No.2010CXB004);the National Natural Science Foundation of China (Grant No.11174190);the National Basic Research Program of China (Grant No.2009CB930700)

摘　　要：The fluorescence enhancement of Rhodanfine 6G （Rh6G） fluorophore in the close vicinity of porous alumina film with ordered nanohole arrays is investigated. Experimental observations show that the nonmetallic substrate with hole arrays enhances the fluorescence intensity. By comparing the fluorescence emissions that are excited with 325 nm and 532 nm, better fluorescence enhancement is obtained with excitation at a shorter wavelength. The study suggests that higher fluorescence excitation effi- ciency due to the energy transfer from oxygen vacancies to Rh6G fluorophore molecules is responsible for better fluorescence enhancement. The contribution of the scattering of nanohole arrays to the fluorescence enhancement is also proposed based on the intensity increase and reduced lifetime when the energy transfer from oxygen vacancy is absent. The result of the current study is useful for developing non-metal substrates in the study of spectroscopic enhancement, and is expected to advance the applications of porous alumina to microanalysis.The fluorescence enhancement of Rhodamine 6G(Rh6G) fluorophore in the close vicinity of porous alumina film with ordered nanohole arrays is investigated.Experimental observations show that the nonmetallic substrate with hole arrays enhances the fluorescence intensity.By comparing the fluorescence emissions that are excited with 325 nm and 532 nm,better fluorescence enhancement is obtained with excitation at a shorter wavelength.The study suggests that higher fluorescence excitation efficiency due to the energy transfer from oxygen vacancies to Rh6G fluorophore molecules is responsible for better fluorescence enhancement.The contribution of the scattering of nanohole arrays to the fluorescence enhancement is also proposed based on the intensity increase and reduced lifetime when the energy transfer from oxygen vacancy is absent.The result of the current study is useful for developing non-metal substrates in the study of spectroscopic enhancement,and is expected to advance the applications of porous alumina to microanalysis.

关 键 词：porous alumina SEF Rh6G oxygen vacancy 

分 类 号：O484.1[理学—固体物理] TB383[理学—物理]