黑磷纳米盘-层等离激元系统中的各向异性可调多阶强耦合
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东华大学 光电信息科学与工程系,上海 201620

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中央高校基本科研业务费专项资金、东华大学研究生创新基金(CUSF-DH-D-2020093),上海市自然科学基金(21ZR1402200)


Anisotropic tunable multi-order strong coupling in black phosphorous nanodisk-sheet plasmonic system
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Department of Optoelectronic Information Science and Engineering, Donghua University, Shanghai 201620, China

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Supported by the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (CUSF-DH-D-2020093), Natural Science Foundation of Shanghai(21ZR1402200)

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    摘要:

    黑磷支持各向异性的表面等离激元,可用于设计具备更多功能的原理性器件。用时域有限差分法数值模拟了中红外到远红外波段基于黑磷的层-盘-层系统中不同等离激元模式之间的杂交行为。通过动态调节黑磷中的载流子浓度,可以实现两个晶格方向上强耦合现象的产生与控制。对不同模式间的耦合进行分析并计算,得到吸收光谱中的拉比分裂能最高可达42.9 meV。此外,还计算了偏振角度对各向异性强耦合的影响,其最高可以实现6个吸收频带。该模型可为构建未来在中远红外波段工作的基于二维材料紧凑型各向异性等离激元器件提供基础。

    Abstract:

    Black phosphorus supports anisotropic surface plasmons, which can be used to design principle devices with more functions. The hybridization behavior of different plasmon modes in the sheet-disk-sheet system based on black phosphorus in the mid-infrared to far-infrared waveband is numerically simulated by the finite-difference time-domain method. By dynamically adjusting the carrier concentration in the black phosphorus, the generation and control of the strong coupling phenomenon in the two lattice directions can be realized. Analyzing and calculating the coupling between different modes, the Rabi splitting energy in the absorption spectrum can be as high as 42.9 meV. In addition, the influence of the polarization angle on the strong anisotropic coupling is also calculated, which can achieve up to 6 absorption bands. The proposed model provides a basis for the construction of compact anisotropic plasmonic devices based on two-dimensional materials that will work in the mid-to-far infrared bands in the future.

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  • 收稿日期:2021-09-22
  • 最后修改日期:2022-03-08
  • 录用日期:2021-10-20
  • 在线发布日期: 2022-02-28
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