Wu Jinqi, Ghosh Sanjib, Su Rui, Fieramosca Antonio, Liew Timothy C H, Xiong Qihua
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
MajuLab, International Joint Research Unit UMI 3654, CNRS, Université Côte d'Azur, Sorbonne Université, National University of Singapore, Nanyang Technological University, https://majulab.cnrs.fr/.
Nano Lett. 2021 Apr 14;21(7):3120-3126. doi: 10.1021/acs.nanolett.1c00283. Epub 2021 Mar 31.
Comparing with pure photons, higher nonlinearity in polariton systems has been exploited in various proof-of-principle demonstrations of efficient optical devices based on the parametric scattering effect. However, most of them demand cryogenic temperatures limited by the small exciton binding energy of traditional semiconductors or exhibit weak nonlinearity resulting from Frenkel excitons. Lead halide perovskites, possessing both a large binding energy and a strong polariton interaction, emerge as ideal platforms to explore nonlinear polariton physics toward room temperature operation. Here, we report the first observation of nonlinear parametric scattering in a lead halide perovskite microcavity with multiple polariton branches at room temperature. Driven by the scattering source from condensation in one polariton branch, correlated polariton pairs are obtained at high states in an adjacent branch. Our results strongly advocate the ability to reach the nonlinear regime essential for perovskite polaritonics working at room temperature.
与纯光子相比，极化激元系统中更高的非线性已在基于参量散射效应的高效光学器件的各种原理验证演示中得到应用。然而，它们中的大多数需要低温，这受到传统半导体小激子结合能的限制，或者表现出由弗伦克尔激子导致的弱非线性。卤化铅钙钛矿具有大的结合能和强的极化激元相互作用，成为探索室温下非线性极化激元物理的理想平台。在此，我们报告了在室温下首次观察到具有多个极化激元分支的卤化铅钙钛矿微腔中的非线性参量散射。由一个极化激元分支中的凝聚散射源驱动，在相邻分支的高态下获得了相关的极化激元对。我们的结果有力地证明了达到室温下钙钛矿极化激元学所需的非线性 regime 的能力。
