Volume 136, Issue 38 e202406941
Forschungsartikel

Unlocking Giant Third-Order Optical Nonlinearity in (MA)2CuX4 through Introducing Jahn-Teller Distortion

Ms. Bingyue Li

Ms. Bingyue Li

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Data curation (lead), ​Investigation (lead), Writing - original draft (lead)

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Dr. Hui Li

Dr. Hui Li

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Methodology (supporting)

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Prof. Chao Wu

Prof. Chao Wu

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Writing - review & editing (supporting)

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Dr. LuLu Fu

Dr. LuLu Fu

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Writing - review & editing (supporting)

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Prof. Danil W. Boukhvalov

Prof. Danil W. Boukhvalov

College of Science, Nanjing Forestry University, Nanjing 210037, P.R. China, Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia

Contribution: Methodology (supporting)

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Prof. Mark G. Humphrey

Prof. Mark G. Humphrey

Research School of Chemistry, Australian National University, Canberra, ACT 2601 Australia

Contribution: Writing - review & editing (supporting)

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Prof. Chi Zhang

Corresponding Author

Prof. Chi Zhang

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Funding acquisition (equal), Resources (equal), Writing - review & editing (equal)

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Prof. Zhipeng Huang

Corresponding Author

Prof. Zhipeng Huang

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092 P.R. China

Contribution: Formal analysis (lead), Resources (equal), Supervision (lead), Writing - review & editing (lead)

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First published: 24 May 2024

Abstract

Nonlinear absorption coefficient and modulation depth stand as pivotal properties of nonlinear optical (NLO) materials, while the existing NLO materials exhibit limitations such as low nonlinear absorption coefficients and/or small modulation depths, thereby severely impeding their practical application. Here we unveil that introducing Jahn–Teller distortion in a Mott-Hubbard system, (MA)2CuX4 (MA=methylammonium; X=Cl, Br) affords the simultaneous attainment of a giant nonlinear absorption coefficient and substantial modulation depth. The optimized compound, (MA)2CuCl4, demonstrates a nonlinear absorption coefficient of (1.5±0.08)×105 cm GW−1, a modulation depth of 60 %, and a relatively low optical limiting threshold of 1.22×10−5 J cm−2. These outstanding attributes surpass those of most reported NLO materials. Our investigation reveals that a more pronounced distortion of the [CuX6]4− octahedron emerges as a crucial factor in augmenting optical nonlinearity. Mechanism study involving structural and spectral characterization along with theoretical calculations indicates a correlation between the compelling performance and the Mott-Hubbard band structure of the materials, coupled with the Jahn–Teller distortion-induced d-d transition. This study not only introduces a promising category of high-performance NLO materials but also provides novel insights into enhancing the performance of such materials.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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