Enhancing fluorescence of quantum dots by silica-coated gold nanorods under one- and two-photon excitation

被引：67
作者：
Li, Xin [1 ,2 ]
Kao, Fu-Jen [3 ]
Chuang, Chien-Chin [3 ]
He, Sailing [1 ,2 ]
机构：
[1] Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China
[2] Royal Inst Technol, Joint Res Ctr Photon, Stockholm, Sweden
[3] Natl Yang Ming Univ, Inst Biophoton, Taipei 11221, Taiwan
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 11期
关键词：
SINGLE-MOLECULE FLUORESCENCE; SPONTANEOUS EMISSION; RAMAN-SCATTERING; ENHANCEMENT; NANOPARTICLES; LUMINESCENCE; FLUOROPHORES; ABSORPTION; DEPENDENCE; RULERS;
D O I：
10.1364/OE.18.011335
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Nano-composites of quantum dots (QDs) and gold nanorods (GNRs) or silica-coated GNRs (GNRs_SiO2) were synthesized. The attached GNRs modify the excitation intensity and spontaneous emission of QDs through the surface plasmonic effects. The fluorescence from QDs is enhanced and can be optimized by modifying the thickness of silica coated on GNRs, under both one-and two-photon excitations. The measurements of fluorescence intensity and lifetime demonstrate that the enhancement may be attributed to the matching of the localized surface plasmon resonance of GNR to the excitation wavelength. In addition to enhancing QD-fluorescence in QD-GNR@SiO2, GNRs also present as an effective contrast agent for bio-imaging, through light scattering and or two-photon emission, as well as for photo-thermal therapy. The composite's multifunctional characteristics are highly valuable and to be exploited in bio-applications. (C) 2010 Optical Society of America
引用
收藏
页码：11335 / 11346
页数：12
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