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Terahertz spectroscopy of high temperature superconductors and their photonic applications

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An Erratum to this article was published on 30 March 2022

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Abstract

Development of the ultrashort pulse lasers made it possible to realize the terahertz (THz) generation and detection in a broad frequency range between 0.1 and 30 THz. Extensive studies of the superconducting materials have been performed from basic sciences to the photonic applications because the THz frequencies span the gap in the electromagnetic spectrum between the electronic and the photonic technologies. Especially, the ultrashort pulses allow us to monitor the non-equilibrium dynamics of the superconductors and develop the ultrafast switching. Starting from a brief overview of the cuprate superconductor, we review the basic optical properties and photonic applications of the superconductors in a wide range of THz frequencies. It should be noted that numerous equilibrium and non-equilibrium THz spectroscopic measurements of the high temperature superconductors demonstrated the existence of the superconducting gap and its recovery dynamics and also terahertz electromagnetic wave modulation combined with the concept of metamaterials. These superconducting metamaterials will pave the way for better understanding of the new material properties and giving new ideas in application aspects.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF-2018R1D1A1A02048923, NRF-2021R1A2C1008452, NRF-2020R1A2C3013454 and NRF-2020R1A4A1019566), he Republic of Korea’s MSIT (Ministry of Science and ICT), under the High-Potential Individuals Global Training Program (Task No. 2021-0-01580) supervised by the IITP (Institute of Information and Communications Technology Planning & Evaluation), and the 2021 Research Fund (1.210060.01) of Ulsan National Institute of Science and Technology (UNIST).

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  1. Department of Physics, Chungbuk National University, Cheongju, Chungbuk, 28644, Republic of Korea

    Choongwon Seo & Kyungwan Kim

  2. Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea

    Jeonghoon Kim, Seonhye Eom & Hyeong-Ryeol Park

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  1. Choongwon Seo
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Correspondence to Kyungwan Kim or Hyeong-Ryeol Park.

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Seo, C., Kim, J., Eom, S. et al. Terahertz spectroscopy of high temperature superconductors and their photonic applications. J. Korean Phys. Soc. 81, 490–501 (2022). https://doi.org/10.1007/s40042-022-00403-3

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