Positioning of quantum dots on metallic nanostructures
| Autor: | Volker J. Sorger, R K Kramer, Tae-Jin Yim, Nitipat Pholchai, Rupert F. Oulton, Xiang Zhang |
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| Rok vydání: | 2010 |
| Předmět: |
Diffraction
Nanostructure Materials science Photon Field (physics) business.industry Mechanical Engineering Bioengineering Nanotechnology General Chemistry DNA Nanostructures Mechanics of Materials Quantum dot laser Quantum dot Metals Quantum Dots Optoelectronics General Materials Science Electrical and Electronic Engineering business Nanoscopic scale Plasmon Algorithms |
| Zdroj: | Nanotechnology. 21(14) |
| ISSN: | 1361-6528 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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