Detection device and method for properties of terahertz waves

The invention relates to a detection device and method for properties of terahertz waves. The method comprises the following steps: an eigen germanium material panel with tunable reflection space terahertz wave effects, a parabolic reflector, a two-dimensional scan vibration mirror and two one-dimensional direct-current motors are used, the eigen germanium material panel is fixed in a transmitting path of a terahertz collimated light beam, the two-dimensional scan vibration mirror is regulated so that the light beam after beam shrinkage scans different space positions of eigen germanium materials, regions needing detection are reflected, besides, an electro-optical crystal is used for detecting the time domain spectrum of the terahertz light beam, and finally through later-stage spectrum analysis and treatment, the data extraction of the internal electric field range, the frequency and the phase of different regions of the terahertz light beam can be realized. The method disclosed by the invention can be used for solving the scientific difficult problem for detection of source characteristics internationally, can establish basis for later-stage scientific research work, can help users to use different characteristic selecting means according to different sources in practical application, and can improve the application efficiency of the terahertz waves.