Strong plasmonic enhancement of single molecule photostability in silver dimer optical antennas

被引：31
作者：
Kaminska, Izabela [1 ,2 ,3 ,4 ]
Vietz, Carolin [1 ,2 ,3 ]
Cuartero-Gonzalez, Alvaro [5 ,6 ]
Tinnefeld, Philip [1 ,2 ,3 ,7 ]
Fernandez-Dominguez, Antonio I. [5 ,6 ]
Acuna, Guillermo P. [1 ,2 ,3 ]
机构：
[1] Braunschweig Univ Technol, Inst Phys & Theoret Chem, Rebenring 56, D-38106 Braunschweig, Germany
[2] Braunschweig Univ Technol, Braunschweig Integrated Ctr Syst Biol BRICS, Rebenring 56, D-38106 Braunschweig, Germany
[3] Braunschweig Univ Technol, Lab Emerging Nanometrol LENA, Rebenring 56, D-38106 Braunschweig, Germany
[4] Nicolaus Copernicus Univ, Inst Phys, Fac Phys Astron & Informat, Grudziadzka 5, PL-87100 Torun, Poland
[5] Univ Autonoma Madrid, Dept Fis Teor Materia Condensada, E-28049 Madrid, Spain
[6] Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, E-28049 Madrid, Spain
[7] Ludwig Maximilians Univ Muenchen, Dept Chem, Butenandtstr 5-13 Haus E, D-81377 Munich, Germany
来源：
NANOPHOTONICS | 2018年 / 7卷 / 03期
基金：
欧洲研究理事会;
关键词：
photon count enhancement; reduction of photo-bleaching; DNA origami; single-molecule detection; plasmonics; silver nanoparticle; FLUORESCENCE ENHANCEMENT; NANOPARTICLES; EMISSION; EXCITATION;
D O I：
10.1515/nanoph-2017-0081
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Photobleaching is an effect terminating the photon output of fluorophores, limiting the duration of fluorescence-based experiments. Plasmonic nanoparticles (NPs) can increase the overall fluorophore photostability through an enhancement of the radiative rate. In this work, we use the DNA origami technique to arrange a single fluorophore in the 12-nm gap of a silver NP dimer and study the number of emitted photons at the single molecule level. Our findings yielded a 30x enhancement in the average number of photons emitted before photobleaching. Numerical simulations are employed to rationalize our results. They reveal the effect of silver oxidation on decreasing the radiative rate enhancement.
引用
收藏
页码：643 / 649
页数：7
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