[7p-N321-1~15] 3.8 Terahertz technologies

5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[7p-N321-13] Measurement of concave or convex sample by 0.3 THz band spiral interferometry

〇(M2)Kohei Yamaguchi¹, Yu Tokizane², Eiji Hase², Takeshi Yasui² (1.Tokushima Univ., 2.pLED Tokushima Univ.)

Keywords:

terahertz wave,optical vortex,interferometry

Optical vortex interferometry is a method that uses a coaxial interferometer to measure not only the three-dimensional structure of an object but also determine its suppression or depression of the structure from the direction of spiral interference fringes. However, this method is difficult to apply to opaque samples to the visible light. We propose a THz vortex interferometer that utilizes terahertz (THz) waves, which are transparent to the non-metallic materials. We construct the THz system and measure the spiral fringe from the conical sample. The results confirmed that proposed simple interferometry can simultaneously obtain the three-dimensional structure and suppression or depression of the object, demonstrating the possibility of measuring the structure with optically opaque materials.