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Positioning of quantum dots on metallic nanostructures

机译：量子点在金属纳米结构上的定位

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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.
机译：对于构造能够在单光子水平上操纵光的有源光学器件，非常需要将单个发射器（例如量子点）定位在金属纳米结构附近的能力。等离子体技术作为限制光的手段的出现现在引入了对定位任何发射源的高精度和可靠性的需求，这迄今为止是难以捉摸的。现在，将发射源置于等离激元结构的影响范围内需要接近分子长度尺度的精度。在本文中，我们报告了能够可靠地定位纳米级功能对象（特别是量子点）的能力，其精确度低于100 nm，比量子点的发射光的衍射极限小几倍。金属表面上的电子束光刻定义的掩膜和一系列表面化学功能化过程允许DNA连接的胶体量子点的编程组装。利用硫醇化DNA与Au / Ag的特异性结合，并利用链霉亲和素与生物素的相互作用，量子点成功地功能化到小至（100 nm）2的区域。对各种图案尺寸的工艺可重复性的分析表明，该技术有可能以50 nm的精度扩展到单个量子点水平，并伴有产量的适度降低。

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