infrared millimeter terahertz waves scientific conferences

We developed a broadband terahertz wave circular polarizer which consists of a 2-dimensional array of 3-dimensional metallic helix. We evaluate the performance of polarizer using terahertz time domain spectroscopy and we confirmed that the array of helices transmits the circularly polarized terahertz wave with the opposite handedness as that of helices. The polarizer covers the frequency range from 150 GHz to 250 GHz, close to one octave. We obtained the ellipticity of circularly polarized THz wave close to unity in this frequency band.