Fang Jie, Yao Kan, Wang Mingsong, Yu Zhuohang, Zhang Tianyi, Jiang Taizhi, Huang Suichu, Korgel Brian A, Terrones Mauricio, Alù Andrea, Zheng Yuebing
Walker Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States.
Nano Lett. 2023 Nov 8;23(21):9803-9810. doi: 10.1021/acs.nanolett.3c02540. Epub 2023 Oct 25.
Two-dimensional exciton-polaritons in monolayer transition metal dichalcogenides (TMDs) exhibit practical advantages in valley coherence, optical nonlinearities, and even bosonic condensation owing to their light-emission capability. To achieve robust exciton-polariton emission, strong photon-exciton couplings are required at the TMD monolayer, which is challenging due to its atomic thickness. High-quality () factor optical cavities with narrowband resonances are an effective approach but typically limited to a specific excitonic state of a certain TMD material. Herein, we achieve on-demand exciton-polariton emission from a wide range of TMDs at room temperature by hybridizing excitons with broadband Mie resonances spanning the whole visible spectrum. By confining broadband light at the TMD monolayer, our one type of Mie resonator on different TMDs enables enhanced light-matter interactions with multiple excitonic states simultaneously. We demonstrate multi-Rabi splittings and robust polaritonic photoluminescence in monolayer WSe, WS, and MoS. The hybrid system also shows the potential to approach the ultrastrong coupling regime.
由于具有发光能力，单层过渡金属二卤化物（TMDs）中的二维激子极化激元在谷相干、光学非线性甚至玻色凝聚方面展现出实际优势。为了实现稳健的激子极化激元发射，TMD单层需要强的光子 - 激子耦合，然而由于其原子厚度，这具有挑战性。具有窄带共振的高质量（）因子光学腔是一种有效方法，但通常限于特定TMD材料的特定激子态。在此，我们通过将激子与跨越整个可见光谱的宽带米氏共振杂交，在室温下实现了多种TMDs的按需激子极化激元发射。通过将宽带光限制在TMD单层，我们在不同TMDs上的一种米氏谐振器能够同时增强与多种激子态的光 - 物质相互作用。我们在单层WSe、WS和MoS中展示了多拉比分裂和稳健的极化激元光致发光。该混合系统还显示出接近超强耦合 regime 的潜力。
