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Metal–Dielectric Parabolic Antenna for Directing Single Photons
Nano Letters ( IF 10.8 ) Pub Date : 2018-03-29 00:00:00 , DOI: 10.1021/acs.nanolett.8b00557
Sergii Morozov 1 , Michele Gaio 1 , Stefan A. Maier 1, 2 , Riccardo Sapienza 1
Affiliation  

Quantum emitters radiate light omni-directionally, making it hard to collect and use the generated photons. Here, we propose a three-dimensional metal–dielectric parabolic antenna surrounding an individual quantum dot as a source of collimated single photons, which can then be easily extracted and manipulated. Our fabrication method relies on a single optically induced polymerization step once the selected emitter has been localized by confocal microscopy. Compared to conventional nanoantennas, our geometry does not require near-field coupling, and it is, therefore, very robust against misalignment issues and minimally affected by absorption in the metal. The parabolic antenna provides one of the largest reported experimental directivities (D = 106) and the lowest beam divergences (Θ1/2 = 13.5°) and a broadband operation over all of the visible and near-infrared range together with extraction efficiency of more than 96%, offering a practical advantage for quantum technological applications.

中文翻译:

金属介电抛物面天线,用于引导单光子

量子发射器全方位辐射光,使其很难收集和使用所产生的光子。在这里,我们提出一种围绕单个量子点的三维金属-介质抛物线形天线,作为准直单光子的来源,然后可以很容易地对其进行提取和操作。一旦选定的发射体已经通过共聚焦显微镜定位,我们的制造方法就依赖于单个光诱导聚合步骤。与传统的纳米天线相比,我们的几何形状不需要近场耦合,因此它非常坚固,可以防止未对准问题,并且受金属吸收的影响最小。抛物线天线提供了最大的实验方向性(D = 106)和最低的波束发散度(Θ1 /2)之一 = 13.5°)和在所有可见光和近红外范围内的宽带操作以及超过96%的提取效率,为量子技术应用提供了实际优势。
更新日期:2018-03-29
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