中国物理B ›› 2024, Vol. 33 ›› Issue (4): 44403-044403.doi: 10.1088/1674-1056/ad2a6c

所属专题： SPECIAL TOPIC — Heat conduction and its related interdisciplinary areas

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Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials

Ruiyi Liu(刘睿一)1, Haotuo Liu(刘皓佗)2, Yang Hu(胡杨)3, Zheng Cui(崔峥)2,†, and Xiaohu Wu(吴小虎)2,‡   

  1. 1 Institute of Advanced Technology, Shandong University, Jinan 250061, China;
    2 Shandong Institute of Advanced Technology, Jinan 250100, China;
    3 School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2023-11-21 修回日期:2024-01-29 接受日期:2024-02-19 出版日期:2024-03-19 发布日期:2024-03-27
  • 通讯作者: Zheng Cui, Xiaohu Wu E-mail:zhengc@sdu.edu.cn;xiaohu.wu@iat.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52106099), the Natural Science Foundation of Shandong Province of China (Grant No. ZR2022YQ57), and the Taishan Scholars Program.

Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials

Ruiyi Liu(刘睿一)1, Haotuo Liu(刘皓佗)2, Yang Hu(胡杨)3, Zheng Cui(崔峥)2,†, and Xiaohu Wu(吴小虎)2,‡   

  1. 1 Institute of Advanced Technology, Shandong University, Jinan 250061, China;
    2 Shandong Institute of Advanced Technology, Jinan 250100, China;
    3 School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2023-11-21 Revised:2024-01-29 Accepted:2024-02-19 Online:2024-03-19 Published:2024-03-27
  • Contact: Zheng Cui, Xiaohu Wu E-mail:zhengc@sdu.edu.cn;xiaohu.wu@iat.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52106099), the Natural Science Foundation of Shandong Province of China (Grant No. ZR2022YQ57), and the Taishan Scholars Program.

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摘要： Relative rotation between the emitter and receiver could effectively modulate the near-field radiative heat transfer (NFRHT) in anisotropic media. Due to the strong in-plane anisotropy, natural hyperbolic materials can be used to construct near-field radiative modulators with excellent modulation effects. However, in practical applications, natural hyperbolic materials need to be deposited on the substrate, and the influence of substrate on modulation effect has not been studied yet. In this work, we investigate the influence of substrate effect on near-field radiative modulator based on α-MoO3. The results show that compared to the situation without a substrate, the presence of both lossless and lossy substrate will reduce the modulation contrast (MC) for different film thicknesses. When the real or imaginary component of the substrate permittivity increases, the mismatch of hyperbolic phonon polaritons (HPPs) weakens, resulting in a reduction in MC. By reducing the real and imaginary components of substrate permittivity, the MC can be significantly improved, reaching 4.64 for εs = 3 at t = 10 nm. This work indicates that choosing a substrate with a smaller permittivity helps to achieve a better modulation effect, and provides guidance for the application of natural hyperbolic materials in the near-field radiative modulator.

关键词: near-field radiative modulator, substrate effect, hyperbolic material, modulation contrast

Abstract: Relative rotation between the emitter and receiver could effectively modulate the near-field radiative heat transfer (NFRHT) in anisotropic media. Due to the strong in-plane anisotropy, natural hyperbolic materials can be used to construct near-field radiative modulators with excellent modulation effects. However, in practical applications, natural hyperbolic materials need to be deposited on the substrate, and the influence of substrate on modulation effect has not been studied yet. In this work, we investigate the influence of substrate effect on near-field radiative modulator based on α-MoO3. The results show that compared to the situation without a substrate, the presence of both lossless and lossy substrate will reduce the modulation contrast (MC) for different film thicknesses. When the real or imaginary component of the substrate permittivity increases, the mismatch of hyperbolic phonon polaritons (HPPs) weakens, resulting in a reduction in MC. By reducing the real and imaginary components of substrate permittivity, the MC can be significantly improved, reaching 4.64 for εs = 3 at t = 10 nm. This work indicates that choosing a substrate with a smaller permittivity helps to achieve a better modulation effect, and provides guidance for the application of natural hyperbolic materials in the near-field radiative modulator.

Key words: near-field radiative modulator, substrate effect, hyperbolic material, modulation contrast

中图分类号:  (Thermal radiation)

  • 44.40.+a
78.20.-e (Optical properties of bulk materials and thin films) 71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions)) 78.20.Bh (Theory, models, and numerical simulation)