Based on coherently measuring the longitudinal field of a converging terahertz (THz) wave, a polarization determination method to the THz radiation is proposed. By utilizing the method, the arbitrary uniform polarization state of a THz field can be effectively identified in a single measurement. By using the vector diffraction integral, the principle of the method is theoretically discussed in detail. The feasibility of the method is validated experimentally by measuring a THz wire grating polarizer and a THz quarter-wave plate. The method offers a powerful technical support for developing the THz polarization spectroscopy.

中文翻译：

---

基于会聚太赫兹波纵向场的极化确定

在相干测量会聚太赫兹（THz）波的纵向场的基础上，提出了一种对太赫兹辐射进行偏振确定的方法。通过使用该方法，可以在一次测量中有效地识别出太赫兹场的任意均匀偏振态。通过使用矢量衍射积分，从理论上详细讨论了该方法的原理。通过测量太赫兹线栅偏振器和太赫兹四分之一波片，通过实验验证了该方法的可行性。该方法为开发太赫兹偏振光谱学提供了强大的技术支持。