Flexible Control of Broadband Polarization in a Spintronic Terahertz Emitter Integrated with Liquid Crystal and Metasurface,ACS Applied Materials & Interfaces

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Flexible Control of Broadband Polarization in a Spintronic Terahertz Emitter Integrated with Liquid Crystal and Metasurface
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-23 , DOI: 10.1021/acsami.2c04782
Yun Sun _{1,

2,

3} , Yong Xu _{1,

3} , Helin Li ₁ , Yongshan Liu _{1,

3} , Fan Zhang _{1,

3} , Houyi Cheng _{1,

3} , Shina Tao ₄ , Huacai Wang ₄ , Wei Hu ₄ , Yanqing Lu ₄ , Chao Zhao ₁ , Tianxiao Nie _{1,

2,

3} , Weisheng Zhao _{1,

2,

3} , Qi Guo ₅ , Lianggong Wen _{1,

2}

Affiliation

Flexible polarization control of the terahertz wave in the wide bandwidth is crucial for numerous applications, such as terahertz communication, material characterization, imaging, and biosensing diagnosis. However, this promise is impeded by the operating bandwidth of circular polarization states, control modes, and the efficiency of the regulation. Here, we report a spintronic terahertz emitter integrated with phase complementary elements, consisting of a liquid crystal and metasurface, to achieve broadband polarization control with high flexibility. This strategy allows the broadband conversion between linear, elliptical, and circular polarization by changing the rotation angle to modulate the space-variant Pancharatnam–Berry phase. The device is characterized with a terahertz time-domain spectroscopy system, demonstrating that the ellipticity of the circular polarization state could keep greater than 0.9 in 0.60–0.99 THz. In the case of an external electro-magnetic field, further polarization modulation experiments are carried out to provide multiple conversion approaches for multi-azimuth. We first propose a method of full broadband polarization state control of the terahertz emitter based on Pancharatnam–Berry phase modulation and an external electro-magnetic field. We believe that such integrated devices with broadband working bandwidth and multiple control modes will make valuable contributions to the development and multi-scene applications of ultrafast terahertz technologies.

中文翻译：

集成液晶和超表面的自旋电子太赫兹发射器中宽带偏振的灵活控制

宽带宽中太赫兹波的灵活偏振控制对于许多应用至关重要，例如太赫兹通信、材料表征、成像和生物传感诊断。然而，这一承诺受到圆极化状态的工作带宽、控制模式和调节效率的阻碍。在这里，我们报告了一种与相位互补元件集成的自旋电子太赫兹发射器，由液晶和超表面组成，以实现具有高灵活性的宽带偏振控制。该策略通过改变旋转角度来调制空间变化的 Pancharatnam-Berry 相位，从而实现线性、椭圆和圆偏振之间的宽带转换。该设备的特点是太赫兹时域光谱系统，证明圆偏振态的椭圆率在 0.60-0.99 THz 范围内可以保持大于 0.9。在外部电磁场的情况下，进一步进行偏振调制实验，为多方位角提供多种转换方法。我们首先提出了一种基于 Pancharatnam-Berry 相位调制和外部电磁场的太赫兹发射器的全宽带偏振态控制方法。我们相信，这种具有宽带工作带宽和多种控制模式的集成设备将为超快太赫兹技术的发展和多场景应用做出宝贵贡献。进一步进行偏振调制实验，为多方位角提供多种转换方法。我们首先提出了一种基于 Pancharatnam-Berry 相位调制和外部电磁场的太赫兹发射器的全宽带偏振态控制方法。我们相信，这种具有宽带工作带宽和多种控制模式的集成设备将为超快太赫兹技术的发展和多场景应用做出宝贵贡献。进一步进行偏振调制实验，为多方位角提供多种转换方法。我们首先提出了一种基于 Pancharatnam-Berry 相位调制和外部电磁场的太赫兹发射器的全宽带偏振态控制方法。我们相信，这种具有宽带工作带宽和多种控制模式的集成设备将为超快太赫兹技术的发展和多场景应用做出宝贵贡献。

更新日期：2022-06-23

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