Extinction characteristic of terahertz wave by carbon smoke materials

In order to acquire extinction characteristics of smokes for terahertz (THz) wave, graphite and carbon black powders were mixed respectively into KBr powder with some certain proportions, and the admixtures were pressed into tablets to measure the THz transmission spectrums using THz time-domain spectroscopy (THz-TDS) from 0.2 to 1.1 THz. At the same time, the THz signal was acquired from the pure KBr powder tablet, which was prepared with same method under same condition. Then, absorption coefficients of graphite and carbon black tablets were deduced based on material parameter estimation method. The result indicates that absorption coefficients of those tablets are enhanced with the increasing frequency and they are improved with the proportions of smoke powders at the same frequency. The absorption coefficient of tablet filled with carbon black powder is greater than it of graphite tablet. The final results demonstrate that THz wave has stronger penetration capacity through graphite smoke, and carbon black is a promising jamming material for THz detection.