Department of Physics , National University of Singapore , 3, Science Drive 3 , Singapore 117542 , Singapore.
Department of Physics , Indian Institute of Technology Madras , Chennai 600036 , India.
ACS Appl Mater Interfaces. 2019 Feb 20;11(7):7288-7295. doi: 10.1021/acsami.8b20179. Epub 2019 Feb 8.
We report the observation of multimode exciton-polaritons in single-crystalline microplates of a two-dimensional (2D) layered metal-organic framework (MOF), which can be synthesized through a facile solvothermal approach, thereby eliminating all fabrication complexities usually involved in the construction of polariton cavities. With a combination of experiments and theoretical modeling, we have found that the exciton-polaritons are formed at room temperature as a result of a strong coupling between Fabry-Perot cavity modes formed inherently by two parallel surfaces of a microplate and Frenkel excitons provided by the 2D layers of dye molecular linkers in the MOF. Flexibility in rational selection of dye linkers for synthesizing such MOFs renders a large-scale, low-cost production of solid-state, micro-exciton-polaritonic devices operating in the visible and near-infrared range. Our work introduces MOFs as a new class of potential materials to explore polariton-related quantum phenomena in a cost-effective manner.
我们报告了在二维（2D）层状金属有机骨架（MOF）单晶微板中观察到多模激子极化激元的现象，这种微板可以通过简单的溶剂热方法合成，从而消除了通常在构建极化激元腔时涉及的所有制造复杂性。通过实验和理论建模的结合，我们发现，由于微板两个平行表面之间固有形成的法布里-珀罗腔模式与 MOF 中染料分子连接体的 2D 层提供的 Frenkel 激子之间的强耦合，室温下形成了激子极化激元。通过合理选择用于合成这种 MOF 的染料连接体，可以实现灵活的大规模、低成本生产在可见光和近红外范围内运行的固态微激子极化激元器件。我们的工作引入了 MOF 作为一类新的潜在材料，以经济有效的方式探索与极化激元相关的量子现象。
