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Enhanced Multiphoton Processes in Perovskite Metasurfaces

Enhanced Multiphoton Processes in Perovskite Metasurfaces

Authors :
Fan, Yubin
Tonkaev, Pavel
Wang, Yuhan
Song, Qinghai
Han, Jiecai
Makarov, Sergey V.
Kivshar, Yuri
Xiao, Shumin
Source :
Nano Letters; 20210101, Issue: Preprints
Publication Year :
2021

Abstract

Multiphoton absorption and luminescence are fundamentally important nonlinear processes for utilizing efficient light–matter interaction. Resonant enhancement of nonlinear processes has been demonstrated for many nanostructures; however, it is believed that all higher-order processes are always much weaker than their corresponding linear processes. Here, we study multiphoton luminescence from structured surfaces and, combining multiple advantages of perovskites with the concept of metasurfaces, we demonstrate that the efficiency of nonlinear multiphoton processes can become comparable to the efficiency of the linear process. We reveal that the perovskite metasurface can enhance substantially two-photon stimulated emission with the threshold being comparable with that of the one-photon process. Our modeling of free-carrier dynamics and exciton recombination upon nonlinear photoexcitation uncovers that this effect can be attributed to the local field enhancement in structured media, a substantial increase of the mode overlap, and the selection rules of two-photon absorption in perovskites.

Details

Language :
English
ISSN :
15306984 and 15306992
Issue :
Preprints
Database :
Supplemental Index
Journal :
Nano Letters
Publication Type :
Periodical
Accession number :
ejs57512499
Full Text :
https://doi.org/10.1021/acs.nanolett.1c02074