Polarization is crucial in various fields such as imaging, sensing, and substance detection. A compact, fast, and accurate polarization detection device is vital for these applications. Herein, we demonstrate a multifocus metalens for terahertz polarization detection that requires only a single measurement to obtain complete polarization parameters and reconstruct the polarization state of the incident field. The individual subarrays of this metalens convert each of the six polarized components into the same polarization, which in turn links the Stokes parameters to these six foci. The incident linear polarizations and elliptical polarizations are characterized by Stokes parameters and polarization ellipses. Simulations and experimental results show that the scheme can accurately detect the incident polarization with a single measurement. The proposed metasurface polarimetry may find applications in the fields of real-time terahertz detection and integrated optics.

中文翻译：

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仅需要一次测量的全斯托克斯超表面偏振测量

偏振在成像、传感和物质检测等各个领域都至关重要。紧凑、快速且准确的偏振检测设备对于这些应用至关重要。在这里，我们展示了一种用于太赫兹偏振检测的多焦点超透镜，只需一次测量即可获得完整的偏振参数并重建入射场的偏振态。该超透镜的各个子阵列将六个偏振分量中的每一个转换为相同的偏振，从而将斯托克斯参数与这六个焦点联系起来。入射线偏振和椭圆偏振通过斯托克斯参数和偏振椭圆来表征。仿真和实验结果表明，该方案可以通过单次测量准确检测入射偏振。所提出的超表面偏振测量可能会在实时太赫兹检测和集成光学领域得到应用。