Abstract

A high-efficiency visualized terahertz (THz) power meter based on the THz-photothermochromism of capsulized cholesteric liquid crystals (CCLCs) embedded in three- dimensional porous graphene (3DPG) is proposed. The graphene is a broadband perfect absorber for THz radiation and transfers heat efficiently, and its black background is beneficial for color measurement. We have achieved the relationship between THz power and the hue value of single and multi-microcapsule respectively. Quantitative visualization of THz intensity up to 2.8*10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> mW/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> is presented. The minimal detectable THz power is 0.009 mW. The device can convert THz radiation to visible light and is lightweight, cheap, and easy to use.

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