Imran Muhammad, Musa Muhyiddeen Yahya, Rauf Sajid, Lu Dajiang, Li Rujiang, Tian Yibin
College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, 518000, China.
Department of Agriculture and Bio-Environmental Engineering Technology, Audu Bako College of Agriculture Dambatta, Kano, Nigeria.
Sci Rep. 2024 May 2;14(1):10068. doi: 10.1038/s41598-024-60891-0.
Infrared perfect absorption has been widely investigated due to its potential applications in photodetectors, photovoltaics and medical diagnostics. In this report, we demonstrate that at particular infrared frequencies, a simple planar structure made up of graphene-hexagonal Boron Nitride (hBN) hyper-structure is able to nearly perfectly absorb incident light irrespective of its polarization (Transverse-Magnetic TM, or Transverse-Electric TE). By using this interferenceless technique, the hyper-structure achieves nearly zero reflectance at a wide range of angles in a narrow frequency band. We analytically predict the condition of achieving such an important feature of perfect absorption for both TM and TE polarizations. Interestingly, the infrared perfect absorption can be redshifted by increasing the thickness of the hBN layers and blueshifted by increasing the graphene's chemical potential. Such flexible control of infrared perfect absorption offers a new tool for controlling electromagnetic waves and has potential applications in photodetection and other light control applications.
由于红外完美吸收在光电探测器、光伏和医学诊断等领域的潜在应用，其已得到广泛研究。在本报告中，我们证明，在特定的红外频率下，一种由石墨烯 - 六方氮化硼（hBN）超结构构成的简单平面结构，无论其偏振（横向磁波TM或横向电波TE）如何，都能够几乎完美地吸收入射光。通过使用这种无干涉技术，该超结构在窄频带内的宽角度范围内实现了近乎零反射率。我们通过分析预测了实现TM和TE偏振完美吸收这一重要特性的条件。有趣的是，红外完美吸收可以通过增加hBN层的厚度而发生红移，通过增加石墨烯的化学势而发生蓝移。这种对红外完美吸收的灵活控制为控制电磁波提供了一种新工具，并在光电探测和其他光控应用中具有潜在应用价值。
