Spinning thermal radiation from twisted two different anisotropic materials

Author:

Liu Pingan1,Zhou Limei2,Tang Jianxin3,Wu Biyuan4,Liu Haotuo5,Wu XiaohuORCID

Affiliation:

1. Qingdao Quenda Terahertz Technology Co.

2. China Electric Power Research Institute

3. Shandong Industrial Ceramics Research & Design Institute Co.

4. Northwestern Polytechnical University

5. Harbin Institute of Technology

Abstract

Thermal radiation has applications in numerous fields, such as radiation cooling, thermal imaging, and thermal camouflage. Micro/nanostructures such as chiral metamaterials with polarization-dependent or symmetry-breaking properties can selectively emit circularly (spin) polarized polarization waves. In this paper, we propose and demonstrate the spinning thermal radiation from two twisted different anisotropic materials. Taking industrial polymer and biaxial hyperbolic material α-MoO3 as an example, it is found that broadband spinning thermal radiation can be obtained from 13 µm to 18 µm. The spin thermal radiation of the proposed twisted structure originates from the combined effect of polarization conversion of circularly polarized wave and selective absorption of linearly polarized wave by the top and bottom layers of anisotropic materials, respectively. Besides, the narrowband spinning thermal radiation with 0.9 circular dichroism is achieved at wavelength of 12.39 µm and 18.93 µm for finite thickness α-MoO3 due to the epsilon-near-zero mode, and the magnetic field distribution can confirm the phenomenon. This work achieves broadband and narrowband spin thermal radiation and significantly enhances circular dichroism, which may have applications in biological sensing and thermal detection.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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