Broadband enhancement of absorption by two-dimensional atomic crystals modeled as non-Hermitian photonic scattering

Xingzhou Chen; Zheng Sun; Min Zhang; Ming Li; Zhigao Hu; Kenji Watanabe; Takashi Taniguchi; David Snoke; Zhe-Yu Shi; Jian Wu

doi:10.1063/5.0134789

ジャーナル論文 Broadband enhancement of absorption by two-dimensional atomic crystals modeled as non-Hermitian photonic scattering

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Xingzhou Chen, Zheng Sun, Min Zhang, Ming Li, Zhigao Hu, Kenji Watanabe, Takashi Taniguchi, David Snoke, Zhe-Yu Shi, Jian Wu. Broadband enhancement of absorption by two-dimensional atomic crystals modeled as non-Hermitian photonic scattering. Applied Physics Letters. 2023, 122 (4), 041105. https://doi.org/10.1063/5.0134789

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(abstract)

We report the design and fabrication of a vertical structure using a distributed Bragg reflector (DBR) and spacer layer to achieve optimized optical absorption enhancement for a stack of monolayer WS2 and MoS2, namely a 10-fold increase of absorption over a 100 nm spectral range. Our research indicates that we can approach over 50% absorption by finely tuning the thickness of the spacer layer. Our theoretical model shows that the dependence of the absorption coefficient on the spacer thickness can be understood as a solution of a non-Hermitian Schrodinger equation. These results advance the development of broadband optical devices using two-dimensional excitonic materials.

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