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Title: Nonlinear parametric scattering of exciton polaritons in perovskite microcavities
Authors: Wu, Jinqi
Ghosh, Sanjib
Su, Rui
Fieramosca, Antonio
Liew, Timothy Chi Hin
Xiong, Qihua
Keywords: Science::Physics::Optics and light
Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2021
Source: Wu, J., Ghosh, S., Su, R., Fieramosca, A., Liew, T. C. H. & Xiong, Q. (2021). Nonlinear parametric scattering of exciton polaritons in perovskite microcavities. Nano Letters, 21(7), 3120-3126.
Project: MOE2017-T2-1-001 
Journal: Nano Letters 
Abstract: 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 k states in an adjacent branch. Our results strongly advocate the ability to reach the nonlinear regime essential for perovskite polaritonics working at room temperature.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.1c00283
DOI (Related Dataset): 10.21979/N9/3ZWUGJ
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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