Tunable THz reflection-type polarizer based on monolayer phosphorene

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

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Tunable THz reflection-type polarizer based on monolayer phosphorene

机译：基于单层磷烯的可调谐THz反射型偏振器

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We demonstrate a tunable reflection-type polarizer in the terahertz (THz) regime formed by inserting a monolayer phosphorene in a Fabry-Perot cavity composed of a metal substrate and a distributed Bragg reflector. The physical mechanism of the polarizer is analyzed through the reflection spectrum, the electric field distribution, the energy flow, and the power dissipation density calculated by transfer-matrix method and finite-difference time-domain method. The results show that the polarization-selected reflection is caused by the in-plane anisotropic absorption of the phosphorene due to its special atomic lattice, and the polarization selection is further enhanced by the cavity resonator. A polarized reflection light can be obtained with a polarizing extinction ratio of more than 20 dB and a total reflectivity around 50% in the designed THz frequency. The operation frequency of the polarizer can be tuned by the angle of the incident light, the doping electron concentration, and the uniaxial strains of the phosphorene. The refection-type polarizer provides many applications such as filters, detectors, and biosensors. (C) 2019 Optical Society of America

机译：我们通过在由金属基板和分布式布拉格反射器组成的法布里 - 珀罗腔中，通过将单层磷烯插入制造单层磷烯中形成的Terahertz（THz）制度中的可调谐反射型偏振器。通过转移矩阵法计算的反射光谱，电场分布，能量流和功耗密度和有限差分时间域方法来分析偏振器的物理机制。结果表明，由于其特殊的原子晶格，偏振片选择的偏振反射引起了磷烯的面内各向异性吸收，并且腔谐振器进一步增强了偏振选择。可以以大于20dB的偏振消光比率获得偏振反射光，并且在设计的THz频率中的总反射率约为50％。偏振器的操作频率可以通过入射光，掺杂电子浓度和磷烯的单轴菌株调谐。 Refect-Type偏振器提供许多应用，例如过滤器，探测器和生物传感器。（c）2019年光学学会

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来源
《Applied optics》 |2019年第35期|共8页
作者
Dong Daxing; Liu Youwen; Fan Yongqing; Fei Yue; Li Junsheng; 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;

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正文语种 eng
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Tunable THz reflection-type polarizer based on monolayer phosphorene

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