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

Lei Wang; Hongsong Qiu; Thanh  Nhat Khoa Phan; Kosaku Kato; Boyoung Kang; Keisuke Takano; Yanqing Lu; Lujian Chen; Peng Lv; Kehan Yu; Wei Wei; Biaobing Jin; Makoto Nakajima

doi:10.3390/app8122580

Applied Sciences (Dec 2018)

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

Lei Wang,
Hongsong Qiu,
Thanh Nhat Khoa Phan,
Kosaku Kato,
Boyoung Kang,
Keisuke Takano,
Yanqing Lu,
Lujian Chen,
Peng Lv,
Kehan Yu,
Wei Wei,
Biaobing Jin,
Makoto Nakajima

Affiliations

Lei Wang: College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Hongsong Qiu: Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Thanh Nhat Khoa Phan: Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Kosaku Kato: Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Boyoung Kang: Center for Advanced Meta-Materials, Daejeon 305-343, Korea
Keisuke Takano: Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Yanqing Lu: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Lujian Chen: Department of Electronic Engineering, Xiamen University, Xiamen 361005, China
Peng Lv: College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Kehan Yu: College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Wei Wei: College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Biaobing Jin: Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Makoto Nakajima: Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan

DOI: https://doi.org/10.3390/app8122580
Journal volume & issue: Vol. 8, no. 12
p. 2580

Abstract

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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.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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