Abstract
The accidental Dirac cone of a photonic crystal allows the realization of a low loss dielectric metamaterial with simultaneous near-zero effective permittivity and permeability. The resulting zero refractive index allowed applications that require unique spatial coherency. While most thermal light sources were considered highly incoherent, structurally engineered thermal emitters have achieved relatively high spatial coherency. Here, we propose an epsilon-and-mu-near-zero metamaterial as a spatial coherency converter for thermal emissions, and experimentally demonstrate surface-normal directional emissions with an angular width of 20 degrees.
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Acknowledgments
We thank Jaeman Song for calculating silicon optical properties, Dr. Hyeon-Don Kim, Dr. Hyun Sung Park, and Dr. Kanghee Lee for helpful discussions. This work was supported by the National Research Foundation of Korea (NRF) through the government of Korea (MSIT) (Grant No. NRF-2017R1A2B3012364). This work was supported by the Center for Advanced Meta-Materials (CAMM) funded by the Ministry of Science and ICT as Global Frontier Project (CAMMNo. 2014M3A6B3063709). This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning (2017M3C1A3013923).
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Kang, B., Kim, M., Seo, J. et al. Partially Spatial Coherent Thermal Emitter Based on an Epsilon-and-mu-near-zero Metamaterial. J. Korean Phys. Soc. 76, 889–894 (2020). https://doi.org/10.3938/jkps.76.889
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DOI: https://doi.org/10.3938/jkps.76.889