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Title: All-optical switching based on interacting exciton polaritons in self-assembled perovskite microwires
Authors: Feng, Jiangang
Wang, Jun
Fieramosca, Antonio
Bao, Ruiqi
Zhao, Jiaxin
Su, Rui
Peng, Yutian
Liew, Timothy Chi Hin
Sanvitto, Daniele
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2021
Source: Feng, J., Wang, J., Fieramosca, A., Bao, R., Zhao, J., Su, R., Peng, Y., Liew, T. C. H., Sanvitto, D. & Xiong, Q. (2021). All-optical switching based on interacting exciton polaritons in self-assembled perovskite microwires. Science Advances, 7(46), eabj6627-.
Project: MOE2018-T3-1-002 
Journal: Science Advances 
Abstract: Ultrafast all-optical switches and integrated circuits call for giant optical nonlinearity to minimize energy consumption and footprint. Exciton polaritons underpin intrinsic strong nonlinear interactions and high-speed propagation in solids, thus affording an intriguing platform for all-optical devices. However, semiconductors sustaining stable exciton polaritons at room temperature usually exhibit restricted nonlinearity and/or propagation properties. Delocalized and strongly interacting Wannier-Mott excitons in metal halide perovskites highlight their advantages in integrated nonlinear optical devices. Here, we report all-optical switching by using propagating and strongly interacting exciton-polariton fluids in self-assembled CsPbBr3 microwires. Strong polariton-polariton interactions and extended polariton fluids with a propagation length of around 25 μm have been reached. All-optical switching on/off of polariton propagation can be realized in picosecond time scale by locally blue-shifting the dispersion with interacting polaritons. The all-optical switching, together with the scalable self-assembly method, highlights promising applications of solution-processed perovskites toward integrated photonics operating in strong coupling regime.
ISSN: 2375-2548
DOI: 10.1126/sciadv.abj6627
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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