Circular track photoconductive antenna array for terahertz polarization imaging system

Abstract

The invention discloses a circular track photoconductive antenna array for a terahertz polarization imaging system, which comprises M antenna array units fixed on a substrate, the M antenna array units are uniformly arranged into a circle, and the continuous first to (M / 2) th antenna array units are horizontally arranged, the arrangement mode of the (M + 1) / 2 th antenna array unit to the Mth antenna array unit is perpendicular to the arrangement mode of the first antenna array unit; the invention also discloses another structure which comprises a first semicircular antenna array, a second semicircular antenna array, a third semicircular antenna array and an Nth semicircular antenna array which are fixed on the substrate, the circle centers of the first semicircular antenna array, the second semicircular antenna array and the Nth semicircular antenna array are the same, and the radiuses of the first semicircular antenna array, the second semicircular antenna array and the Nth semicircular antenna array are gradually increased. By changing the arrangement structure of the antenna array units on the circular track photoconductive antenna array and combining the non-polarization imaging system, the polarization information and the light intensity information of the detected object in different polarization states can be obtained, and the detection and recognition capability of the imaging system on the target object can be improved.

Description

technical field [0001] The invention relates to the field of imaging, in particular to a circular track photoconductive antenna array for a terahertz polarization imaging system. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz, corresponding to a wavelength of 0.03-3mm, and are located between infrared and microwave in the electromagnetic spectrum. Terahertz waves have many unique advantages. For example, compared with X-rays, terahertz photons have very low energy and will not produce ionizing radiation that will damage the sample to be tested; compared with infrared light, terahertz waves can penetrate many non-polar regions. In addition, the vibration and rotational energy levels of most organic molecules such as polar molecules and biomacromolecules are located in the terahertz band, and the fingerprint characteristics of these molecules can be detected by broadband terahertz spectroscopy. Based on ...

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Problems solved by technology

[0004] The current terahertz polarization imaging is mostly based on the ZnTe crystal method rather than the photoconductive antenna method, because the photoconductive antenna used as a detector in the time-domain terahertz system based on photoconductive antenna generally has only one electrode unit, and the direction of the electrode unit is fixed and single. , the data about the polarization information of the object to be measured cannot be obtained

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