Designing a nearly perfect infrared absorber in monolayer black phosphorus

Dong Daxing; Liu Youwen; Fei Yue; Fan Yongqing; Li Junsheng; Feng Yuncai; Fu Yangyang

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Designing a nearly perfect infrared absorber in monolayer black phosphorus

机译：在单层黑磷中设计几乎完美的红外吸收器

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Black phosphorus (BP) is a type of 2D layered material with a direct bandgap that displays high carrier mobility and strong in-plane anisotropy; it also exhibits potential as a promising optoelectronic material for IR applications. In this paper, we propose a nearly perfect IR absorber composed of a metal film, a spacer with a monolayer BP inside, and a distributed Bragg reflector (DBR). The electric field is confined inside the resonator generated by the metal film and DBR, and the absorption can be enhanced up to nearly 100%, owing to the strong interaction of BP with the confined field. Our results show that the absorption performance of the proposed structure is not only critically dependent on the electron density but also relies on the position of the BP within the spacer. This dependence can be mitigated because the absorption peak wavelength can be tuned by adjusting the angle of the light and the parameters of the DBR. Moreover, the absorber can be served as a reflective linear polarizer based on the anisotropic absorption properties. Our work can be helpful in designing a narrow perfect absorber and polarization-sensitive devices for IR waves. (C) 2019 Optical Society of America

机译：黑磷（BP）是一种2D层状材料，具有直接带隙，可显示高载流子迁移率和强型面内各向异性;它还表现为IR应用的有前途光电材料。在本文中，我们提出了由金属膜组成的几乎完美的IR吸收体，内部具有单层BP的间隔物和分布式布拉格反射器（DBR）。电场限制在由金属膜和DBR产生的谐振器内，由于BP与限制领域的强度相互作用，吸收可以增强至近100％。我们的结果表明，所提出的结构的吸收性能不仅依赖于电子密度，还依赖于间隔物内的BP位置。可以通过调节光的角度和DBR的参数来调节吸收峰值波长，因此可以减轻这种依赖性。此外，吸收器可以基于各向异性吸收性能用作反射线性偏振器。我们的工作可以帮助设计狭窄的完美吸收器和IR波的极化敏感器件。（c）2019年光学学会

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《Applied optics》 |2019年第14期|共8页
作者
Dong Daxing; Liu Youwen; Fei Yue; Fan Yongqing; Li Junsheng; Feng Yuncai; Fu Yangyang;
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Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Dept Appl Phys Nanjing 210016 Jiangsu Peoples R China;

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Designing a nearly perfect infrared absorber in monolayer black phosphorus

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