Challenge to development of circular dichroism and optical activity detection system in the terahertz region

我们的目标是开发太赫兹区域的光学活性和/或圆二色性观测系统及其检测。首先，我们开发了太赫兹偏振控制系统和太赫兹偏振分析系统。该系统由线栅型线性偏振器和x切割石英晶体相移器组成。利用s波段直线加速器产生的强相干太赫兹辐射作为光源。验证了偏振控制系统可产生水平直线偏振和右椭圆偏振。在此基础上，开发了光学活度测量系统。我们在太赫兹振荡器上初步测量了0.1太赫兹频率下的z切割石英晶体的旋转角度。

Our aim is to develop the observation system for optical activity and/or circular dichroism in the terahertz region and its detection. At first, we developed the polarization control system and the polarization analysis system in the terahertz region. These systems were composed of wire-grid type linear polarizers and phase shifters made of x-cut quartz crystal. The intense coherent terahertz radiation from the S-band linac was used as a light source. It was confirmed that horizontally linear polarization and right elliptical polarization was generated from polarization control system. Based on these systems, we developed optical activity measurement system. We preliminary measured the rotation angle of z-cut quartz crystal at frequency of about 0.1 THz from the terahertz oscillator.