Abstract
We demonstrate a new method to detect terahertz (THz) power by combining cholesteric liquid crystal microcapsule (CLCM) with three-dimensional porous grapheme (3DPG). The power of the THz radiation is measured using the hue image which is digitalized from the color change of a CLCM. Based on the the rmochromic property of CLCM and the high absorption of 3DPG over 97% in the frequency range of 0.32 THz a quantitative visualization of the THz intensity up to 2.7 × 103 mW/cm2 is presented and the minimal detectable THz power is only 0.009 mW. The THz power meter is cost-effective, portable, and high efficient, which can be used in many applications such as THz imaging, inspection and sensing.
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