Deterministic Positioning of Colloidal Quantum Dots on Silicon Nitride Nanobeam Cavities
Deterministic Positioning of Colloidal Quantum Dots on Silicon Nitride Nanobeam Cavities
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DOI：
10.1021/acs.nanolett.8b02764
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发表时间：
2018-10-01
期刊：
影响因子：
10.8
通讯作者：
Majumdar, Arka
中科院分区：
文献类型：
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作者：
Chen, Yueyang;Ryou, Albert;Majumdar, Arka
设计一个精确定位的腔耦合有源介质阵列是混合集成光子学领域的一个重大实验挑战。我们确定性的位置解决方案处理的胶体量子点（QD）的高品质（Q）因子氮化硅纳米梁腔，并证明光物质耦合。通过在包覆在聚合物抗蚀剂中的封装腔的顶部上光刻地限定窗口，并且旋涂QD溶液，我们可以精确地控制QD的放置，其随后耦合到腔。我们通过修改窗口的大小来基本控制耦合到腔的量子点的数量。此外，我们证明了珀塞尔增强和饱和的光致发光在这个量子点腔平台。最后，我们确定性地定位量子点的光子分子和观察量子点耦合腔超模。我们的研究结果铺平了道路，通过工程的窗口大小，量子点尺寸和溶液化学精确控制耦合到一个腔的量子点的数量，并将允许在腔增强单光子发射，超低功率非线性光学，量子多体模拟与相互作用的光子的高级研究。
Engineering an array of precisely located cavity-coupled active media poses a major experimental challenge in the field of hybrid integrated photonics. We deterministically position solution-processed colloidal quantum dots (QDs) on high quality (Q)-factor silicon nitride nanobeam cavities and demonstrate light-matter coupling. By lithographically defining a window on top of an encapsulated cavity that is cladded in a polymer resist, and spin coating the QD solution, we can precisely control the placement of the QDs, which subsequently couple to the cavity. We show rudimentary control of the number of QDs coupled to the cavity by modifying the size of the window. Furthermore, we demonstrate Purcell enhancement and saturable photoluminescence in this QD-cavity platform. Finally, we deterministically position QDs on a photonic molecule and observe QD-coupled cavity supermodes. Our results pave the way for precisely controlling the number of QDs coupled to a cavity by engineering the window size, the QD dimension, and the solution chemistry and will allow advanced studies in cavity enhanced single photon emission, ultralow power nonlinear optics, and quantum many-body simulations with interacting photons.