Dynamic thermal camouflage via a liquid-crystal-based radiative metasurface
Name
10.1515_nanoph-2019-0485.pdf
Description
Published version
Size
802.81 KB
Format
Unknown
Checksum (MD5)
7cb6abf48b2cd05a6a274c75d8ff2a06
Author(s)
Liu, Yida
Song, Jinlin
Zhao, Weixian
Ren, Xuecheng
Cheng, Qiang
Luo, Xiaobing
Fang, Nicholas Xuanlai
Hu, Run
Date Issued
March 2020
Journal
Nanophotonics
Publisher
Walter de Gruyter GmbH
Citation
Liu, Yida, Song, Jinlin, Zhao, Weixian, Ren, Xuecheng, Cheng, Qiang et al. 2020. "Dynamic thermal camouflage via a liquid-crystal-based radiative metasurface." Nanophotonics, 9 (4).
Version
Final published version
Abstract
AbstractThermal camouflage, which is used to conceal objects in the infrared vision for confrontation with infrared detection in civilian or military applications, has garnered increasing attraction and interest recently. Compared with conductive thermal camouflage, that is to tune heat conduction to achieve equivalent temperature fields, radiative thermal camouflage, based on emissivity engineering, is more promising and shows much superiority in the pursuit of dynamic camouflage technology when resorting to stimuli-responsive materials. In this paper, we demonstrate the emissivity-engineered radiative metasurface to realize dynamic thermal camouflage functionality via a flying laser heat source on the metal-liquid-crystal-metal (MLCM) platform. We employ a rigorous coupled-wave algorithm to calculate the surface emissivity of Au/LC/Au microstructures, where the LC-orientation angle distribution is quantified by minimizing the emitted thermal energy standard deviation throughout the whole plate. Emissivity engineering on the MCLM platform is attributed to multiple magnetic polariton resonance, and agrees well with the equivalent electric circuit analysis. Through this electrical modulation strategy, the moving hot spot in the original temperature field is erased and a uniform temperature field is observed in the infrared camera instead, demonstrating the very good dynamic thermal camouflage functionality. The present MLCM-based radiative metasurface may open avenues for high-resolution emissivity engineering to realize novel thermal functionality and develop new applications for thermal metamaterials and meta-devices.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1515/nanoph-2019-0485
