Terahertz Digital Holography
Yan Zhang (Department of Physics, Capital Normal University, Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Beijing, China)
Due to the natural properties of terahertz (THz) radiations, such as low photon energy, high transmission, broad spectral information, THz sensing and imaging systems have been gradually demonstrated their significant impact in the modern optics. THz imaging technology, which can coherently reconstruct the two-dimensional information of a sample, is one of the most important development directions. To reduce the experimental time consumption, we have proposed a THz digital holographic imaging technique which can coherently capture the information of a THz wavefront, including the frequency, amplitude, phase, and polarization information. In this presentation, I will review some attempts we carried out to improve the performances the THz digital holography system and applications of this system on demonstration of THz planar elements, exploitation of optical tunable THz devices, observation of the THz longitudinal field in a free space and the THz surface wave on a metallic sub-wavelength structure.