Positioning of quantum dots on metallic nanostructures

被引:29
作者
Kramer, R. K. [1 ,2 ]
Pholchai, N. [1 ]
Sorger, V. J. [1 ]
Yim, T. J. [1 ]
Oulton, R. [1 ]
Zhang, X. [1 ]
机构
[1] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA
[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
基金
美国国家科学基金会;
关键词
STRANSKI-KRASTANOW GROWTH; ELECTRON-BEAM LITHOGRAPHY; GOLD NANOPARTICLES; DNA; FLUORESCENCE; INAS; NANOWIRES; DEVICES; ARRAYS;
D O I
10.1088/0957-4484/21/14/145307
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The capability to position individual emitters, such as quantum dots, near metallic nanostructures is highly desirable for constructing active optical devices that can manipulate light at the single photon level. The emergence of the field of plasmonics as a means to confine light now introduces a need for high precision and reliability in positioning any source of emission, which has thus far been elusive. Placing an emission source within the influence of plasmonic structures now requires accuracy approaching molecular length scales. In this paper we report the ability to reliably position nanoscale functional objects, specifically quantum dots, with sub-100-nm accuracy, which is several times smaller than the diffraction limit of a quantum dot's emission light. Electron beam lithography-defined masks on metallic surfaces and a series of surface chemical functionalization processes allow the programmed assembly of DNA-linked colloidal quantum dots. The quantum dots are successfully functionalized to areas as small as (100 nm)(2) using the specific binding of thiolated DNA to Au/Ag, and exploiting the streptavidin-biotin interaction. An analysis of the reproducibility of the process for various pattern sizes shows that this technique is potentially scalable to the single quantum dot level with 50 nm accuracy accompanied by a moderate reduction in yield.
引用
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页数:6
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