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<p>High efficiency, single-band light absorption at the nanoscale plays a&#xa0;vital role in advanced applications such as photothermal conversion, optical sensing, and biomedicine. Here, we propose a&#xa0;vertically stacked hybrid structure composed of aluminum arsenide (AlAs), indium tin oxide (ITO), and gallium arsenide (GaAs). We systematically investigate its absorption characteristics at a&#xa0;wavelength of 1240 nm. When light is incident from the GaAs side, a&#xa0;pronounced localized field enhancement occurs within the structure, leading to a&#xa0;peak absorption efficiency of 92%. Furthermore, the structure exhibits a&#xa0;temperature modulation efficiency of 60.8%, indicating its potential for broadband thermal tuning of absorption. Additionally, the AlAs/ITO/GaAs sandwich configuration demonstrates distinct nonreciprocal optical behavior, meaning the absorption response differs significantly depending on the illumination direction. These results provide a&#xa0;new strategy for designing multifunctional optoelectronic devices that integrate high absorption, thermal tunability, and directional optical response.</p>

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Thermally tunable asymmetric absorption in a hybrid metasurface

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Lin Cheng,
  • Yi Chen,
  • Yuhang Hu,
  • Kaixiang Hou,
  • Zhiyuan Xiong

摘要

High efficiency, single-band light absorption at the nanoscale plays a vital role in advanced applications such as photothermal conversion, optical sensing, and biomedicine. Here, we propose a vertically stacked hybrid structure composed of aluminum arsenide (AlAs), indium tin oxide (ITO), and gallium arsenide (GaAs). We systematically investigate its absorption characteristics at a wavelength of 1240 nm. When light is incident from the GaAs side, a pronounced localized field enhancement occurs within the structure, leading to a peak absorption efficiency of 92%. Furthermore, the structure exhibits a temperature modulation efficiency of 60.8%, indicating its potential for broadband thermal tuning of absorption. Additionally, the AlAs/ITO/GaAs sandwich configuration demonstrates distinct nonreciprocal optical behavior, meaning the absorption response differs significantly depending on the illumination direction. These results provide a new strategy for designing multifunctional optoelectronic devices that integrate high absorption, thermal tunability, and directional optical response.