Katzen Joel M, Tserkezis Christos, Cai Qiran, Li Lu Hua, Kim Jun Min, Lee Gaehang, Yi Gi-Ra, Hendren William R, Santos Elton J G, Bowman Robert M, Huang Fumin
School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, U.K.
Center for Nano Optics, University of Southern Denmark, Campusvej 55, Odense M DK-5230, Denmark.
ACS Appl Mater Interfaces. 2020 Apr 29;12(17):19866-19873. doi: 10.1021/acsami.0c03312. Epub 2020 Apr 15.
Confining light in extremely small cavities is crucial in nanophotonics, central to many applications. Employing a unique nanoparticle-on-mirror plasmonic structure and using a graphene film as a spacer, we create nanoscale cavities with volumes of only a few tens of cubic nanometers. The ultracompact cavity produces extremely strong optical near-fields, which facilitate the formation of single carbon quantum dots in the cavity and simultaneously empower the strong coupling between the excitons of the formed carbon quantum dot and the localized surface plasmons. This is manifested in the optical scattering spectra, showing a magnificent Rabi splitting of up to 200 meV under ambient conditions. In addition, we demonstrate that the strong coupling is tuneable with light irradiation. This opens new paradigms for investigating the fundamental light emission properties of carbon quantum dots in the quantum regime and paves the way for many significant applications.
将光限制在极小的腔中在纳米光子学中至关重要，这是许多应用的核心。通过采用独特的镜上纳米颗粒等离子体结构并使用石墨烯薄膜作为间隔层，我们创建了体积仅为几十立方纳米的纳米级腔。这种超紧凑的腔产生极强的光学近场，这有助于在腔内形成单个碳量子点，同时增强所形成的碳量子点的激子与局域表面等离子体之间的强耦合。这在光学散射光谱中表现出来，在环境条件下显示出高达200 meV的壮观拉比分裂。此外，我们证明了强耦合可通过光照射进行调节。这为研究量子 regime 中碳量子点的基本发光特性开辟了新范式，并为许多重要应用铺平了道路。
