Issue 19, 2022

Nonlinear plexcitons: excitons coupled with plasmons in two-photon absorption

Abstract

The nonlinear optical properties of a D–A (donor–acceptor) conjugated organic molecule with polythiophene (PT) as the donor and indene-C60 bisadduct (IC60BA) as the acceptor are theoretically investigated, which exhibits a large two-photon absorption (TPA) cross-section up to 8000 GM at the wavelength of 780 nm. Combining surface plasmon resonances (SPRs) with nonlinear optics, nonlinear properties can be strongly enhanced. In this paper, an appropriate nonlinear plexciton method by the coupling of Au@Ag nanorods and an Ag film is designed, in which the TPA properties of the PT:IC60BA complex can be increased by 106 times. The angle dependence on polarization and incidence is investigated to obtain the maximum of plasmonic enhancement. Our results emphasize the physical mechanism of nonlinear plexcitons and provide a feasible method to improve the nonlinear properties of organic solar cell materials.

Graphical abstract: Nonlinear plexcitons: excitons coupled with plasmons in two-photon absorption

Supplementary files

Article information

Article type
Paper
Submitted
13 Dec. 2021
Accepted
11 Apr. 2022
First published
11 Apr. 2022

Nanoscale, 2022,14, 7269-7279

Nonlinear plexcitons: excitons coupled with plasmons in two-photon absorption

Y. Chen, Y. Cheng and M. Sun, Nanoscale, 2022, 14, 7269 DOI: 10.1039/D1NR08163B

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