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3D porous graphene-assisted capsulized cholesteric liquid crystals for terahertz power visualization
- Source :
- Optics Letters; October 2020, Vol. 45 Issue: 20 p5892-5895, 4p
- Publication Year :
- 2020
-
Abstract
- We demonstrate 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). The graphene is a broadband perfect absorber for THz radiation and transfers heat efficiently, and its black background is beneficial for color measurement. Quantitative visualization of THz intensity up to 2.8×10^2mW/cm^2 is presented. The minimal detectable THz power is 0.009 mW. With multi-microcapsule analysis, the relationship between THz power and the average hue value of CCLCs achieves linearity. The device can convert THz radiation to visible light and is lightweight, cheap, and easy to use.
Details
- Language :
- English
- ISSN :
- 01469592 and 15394794
- Volume :
- 45
- Issue :
- 20
- Database :
- Supplemental Index
- Journal :
- Optics Letters
- Publication Type :
- Periodical
- Accession number :
- ejs54409157