Elsinger Lukas, Gourgues Ronan, Zadeh Iman E, Maes Jorick, Guardiani Antonio, Bulgarini Gabriele, Pereira Silvania F, Dorenbos Sander N, Zwiller Val, Hens Zeger, Van Thourhout Dries
Photonics Research Group , Ghent University - imec , 9052 Ghent , Belgium.
NB Photonics , Ghent University , 9052 Ghent , Belgium.
Nano Lett. 2019 Aug 14;19(8):5452-5458. doi: 10.1021/acs.nanolett.9b01948. Epub 2019 Jul 23.
Single-photon sources and detectors are indispensable building blocks for integrated quantum photonics, a research field that is seeing ever increasing interest for numerous applications. In this work, we implemented essential components for a quantum key distribution transceiver on a single photonic chip. Plasmonic antennas on top of silicon nitride waveguides provide Purcell enhancement with a concurrent increase of the count rate, speeding up the microsecond radiative lifetime of IR-emitting colloidal PbS/CdS quantum dots (QDs). The use of low-fluorescence silicon nitride, with a waveguide loss smaller than 1 dB/cm, made it possible to implement high extinction ratio optical filters and low insertion loss spectrometers. Waveguide-coupled superconducting nanowire single-photon detectors allow for low time-jitter single-photon detection. To showcase the performance of the components, we demonstrate on-chip lifetime spectroscopy of PbS/CdS QDs. The method developed in this paper is predicted to scale down to single QDs, and newly developed emitters can be readily integrated on the chip-based platform.
单光子源和探测器是集成量子光子学不可或缺的组成部分，这一研究领域在众多应用中受到越来越多的关注。在这项工作中，我们在单个光子芯片上实现了量子密钥分发收发器的关键组件。氮化硅波导顶部的等离子体天线可实现珀塞尔增强，同时提高计数率，加快发射红外光的胶体PbS/CdS量子点（QD）的微秒级辐射寿命。使用低荧光氮化硅，其波导损耗小于1 dB/cm，使得实现高消光比光学滤波器和低插入损耗光谱仪成为可能。波导耦合超导纳米线单光子探测器可实现低时间抖动单光子探测。为了展示这些组件的性能，我们展示了PbS/CdS量子点的片上寿命光谱。本文开发的方法预计可缩小到单个量子点，新开发的发射器可以很容易地集成到基于芯片的平台上。
