Tailoring full-Stokes thermal emission from twisted-gratings structures
Author:
Yang Chiyu1, Cai Wenshan2, Zhang Zhuomin M.1ORCID
Affiliation:
1. George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology , Atlanta , GA 30332 , USA 2. School of Electrical and Computer Engineering , Georgia Institute of Technology , Atlanta , GA 30332 , USA
Abstract
Abstract
Polarized thermal emission finds extensive applications in remote sensing, landmine detection, and target detection. In applications such as ellipsometry and biomedical analysis, the generation of emission with controllable polarization is preferred. It is desired to manipulate the polarization state over the full Stokes parameters. While numerous studies have demonstrated either linear or circular polarization control using metamaterials, full-Stokes thermal emission has not been explored. Here, a microstructure based on two layers of silicon carbide gratings is proposed to tailor the polarization state of thermal emission, covering the full-Stokes parameter range. The bilayer twisted-gratings structure breaks mirror symmetry. Wave interference at the interfaces and diffraction by the gratings enhance the emission dichroism, resulting in almost completely polarized emission. By adjusting the twist angle between the gratings, the polarization state can be continuously tuned from linear to circular, nearly covering the entire surface of Poincaré sphere. This study provides a design for tailoring full-Stokes emission with notable advantages over other plasmonic metasurfaces.
Funder
National Science Foundation Division of Chemical, Bioengineering, Environmental, and Transport Systems
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
Reference45 articles.
1. M. F. Modest and S. Mazumder, Radiative Heat Transfer, 4th ed. San Diego, CA, Academic Press, 2021. 2. Z. M. Zhang, Nano/Microscale Heat Transfer, 2nd ed. Cham, Switzerland, Springer, 2020. 3. J. I. Watjen, X. L. Liu, B. Zhao, and Z. M. Zhang, “A computational simulation of using tungsten gratings in near-field thermophotovoltaic devices,” J. Heat Transfer, vol. 139, no. 5, p. 052704, 2017. https://doi.org/10.1115/1.4035356. 4. J. Xu, J. Mandal, and A. P. Raman, “Broadband directional control of thermal emission,” Science, vol. 372, no. 6540, pp. 393–397, 2021. https://doi.org/10.1126/science.abc5381. 5. J.-J. Greffet, R. Carminati, K. Joulain, J.-P. Mulet, S. Mainguy, and Y. Chen, “Coherent emission of light by thermal sources,” Nature, vol. 416, no. 6876, pp. 61–64, 2002. https://doi.org/10.1038/416061a.
|
|