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Open AccessArticle

Visible Measurement of Terahertz Power Based on Capsulized Cholesteric Liquid Crystal Film

College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Center for Advanced Meta-Materials, Daejeon 305-343, Korea
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Authors to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2580;
Received: 27 October 2018 / Revised: 4 December 2018 / Accepted: 10 December 2018 / Published: 12 December 2018
(This article belongs to the Special Issue Liquid Crystal THz Photonics: Materials, Devices and Applications)
We demonstrate a new method to detect terahertz (THz) power using a temperature-supersensitive capsulized cholesteric liquid crystal film based on the thermochromic and thermodiffusion effect, which is clearly observed. A quantitative visualization of the THz intensity up to 4.0 × 103 mW/cm2 is presented. The diameter of the color change area is linearly dependent on the THz radiation power above 0.07 mW in the steady state. Moreover, the THz power can be detected for 1 sec of radiation with a parabolic relation to the color change area. The THz power meter is robust, cost-effective, portable, and even flexible, and can be used in applications such as THz imaging, biological sensing, and inspection. View Full-Text
Keywords: terahertz; cholesteric liquid crystal; quantitative visualization terahertz; cholesteric liquid crystal; quantitative visualization
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Wang, L.; Qiu, H.; Phan, T.N.K.; Kato, K.; Kang, B.; Takano, K.; Lu, Y.; Chen, L.; Lv, P.; Yu, K.; Wei, W.; Jin, B.; Nakajima, M. Visible Measurement of Terahertz Power Based on Capsulized Cholesteric Liquid Crystal Film. Appl. Sci. 2018, 8, 2580.

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