Compared with the ordinary half wavelength plate, this method shows great superiority in polarization rotating and angles property. When the angle of incidence is less than 20 °, it still can rotate the polarization for 90 °. 与普通的只针对某一特定波长的半波片相比,该偏振旋转器特性大大超越了普通1/2波片,并且入射角在±20°范围仍实现偏振方向旋转90°的要求。