Żołnacz Kinga, Musiał Anna, Srocka Nicole, Große Jan, Schlösinger Maximilian J, Schneider Philipp-Immanuel, Kravets Oleh, Mikulicz Monika, Olszewski Jacek, Poturaj Krzysztof, Wójcik Grzegorz, Mergo Paweł, Dybka Kamil, Dyrkacz Mariusz, Dłubek Michał, Rodt Sven, Burger Sven, Zschiedrich Lin, Sęk Grzegorz, Reitzenstein Stephan, Urbańczyk Wacław
Opt Express. 2019 Sep 16;27(19):26772-26785. doi: 10.1364/OE.27.026772.
We present an effective method for direct fiber coupling of a quantum dot (QD) that is deterministically incorporated into a cylindrical mesa. For precise positioning of the fiber with respect to the QD-mesa, we use a scanning procedure relying on interference of light reflected back from the fiber end-face and the top surface of the mesa, applicable for both single-mode and multi-mode fibers. The central part of the fiber end-face is etched to control the required distance between the top surface of the mesa and the fiber core. Emission around 1260 nm from a fiber-coupled InGaAs/GaAs QD is demonstrated and its stability is proven over multiple cooling cycles. Moreover, a single photon character of emission from such system for a line emitting above 1200 nm is proven experimentally by photon autocorrelation measurements with an obtained value of the second order correlation function at zero time-delay well below 0.5.
我们提出了一种将确定性地集成到圆柱形台面中的量子点（QD）进行直接光纤耦合的有效方法。为了使光纤相对于量子点台面进行精确定位，我们采用了一种扫描程序，该程序依赖于从光纤端面和台面顶表面反射回来的光的干涉，适用于单模和多模光纤。对光纤端面的中心部分进行蚀刻，以控制台面顶表面与光纤纤芯之间所需的距离。展示了光纤耦合的InGaAs/GaAs量子点在1260 nm附近的发射，并证明了其在多个冷却循环中的稳定性。此外，通过光子自相关测量实验证明了该系统在高于1200 nm的谱线发射的单光子特性，在零时间延迟时获得的二阶相关函数值远低于0.5。
