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Photonic comb-rooted synthesis of ultra-stable terahertz frequencies

Author

Listed:
  • Dong-Chel Shin

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Byung Soo Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Heesuk Jang

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Young-Jin Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Seung-Woo Kim

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Stable terahertz sources are required to advance high-precision terahertz applications such as molecular spectroscopy, terahertz radars, and wireless communications. Here, we demonstrate a photonic scheme of terahertz synthesis devised to bring the well-established feat of optical frequency comb stabilization down to the terahertz region. The source comb is stabilized to an ultra-low expansion optical cavity offering a frequency instability of 10−15 at 1-s integration. By photomixing a pair of comb lines extracted coherently from the source comb, terahertz frequencies of 0.10–1.10 THz are generated with an extremely low level of phase noise of –70 dBc/Hz at 1-Hz offset. The frequency instability measured for 0.66 THz is 4.4 × 10−15 at 1-s integration, which reduces to 5.1×10−17 at 65-s integration. Such unprecedented performance is expected to drastically improve the signal-to-noise ratio of terahertz radars, the resolving power of terahertz molecular spectroscopy, and the transmission capacity of wireless communications.

Suggested Citation

  • Dong-Chel Shin & Byung Soo Kim & Heesuk Jang & Young-Jin Kim & Seung-Woo Kim, 2023. "Photonic comb-rooted synthesis of ultra-stable terahertz frequencies," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36507-y
    DOI: 10.1038/s41467-023-36507-y
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    References listed on IDEAS

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    2. C.W. Berry & N. Wang & M.R. Hashemi & M. Unlu & M. Jarrahi, 2013. "Significant performance enhancement in photoconductive terahertz optoelectronics by incorporating plasmonic contact electrodes," Nature Communications, Nature, vol. 4(1), pages 1-10, June.
    3. Tom S. Seifert & Samridh Jaiswal & Joseph Barker & Sebastian T. Weber & Ilya Razdolski & Joel Cramer & Oliver Gueckstock & Sebastian F. Maehrlein & Lukas Nadvornik & Shun Watanabe & Chiara Ciccarelli , 2018. "Femtosecond formation dynamics of the spin Seebeck effect revealed by terahertz spectroscopy," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
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