• Photonics Research
  • Vol. 9, Issue 10, 1892 (2021)
Tianning Zheng1, Bin Wei1、3、*, Fuchuan Lei2、4、*, and Bisong Cao1
Author Affiliations
  • 1Department of Physics, State Key Laboratory Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
  • 2Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
  • 3e-mail: weibin@tsinghua.edu.cn
  • 4e-mail: fuchuan@chalmers.se
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    DOI: 10.1364/PRJ.430185 Cite this Article Set citation alerts
    Tianning Zheng, Bin Wei, Fuchuan Lei, Bisong Cao. Very large group delay in VHF band using coupled high temperature superconducting resonators[J]. Photonics Research, 2021, 9(10): 1892 Copy Citation Text show less

    Abstract

    Storing a very high frequency (VHF) band (30–300 MHz) electromagnetic wave has many potential applications, such as phase modulation, buffering, and radio frequency memory. It can be effectively achieved by applying coupled resonator-based electromagnetically induced transparency (EIT) due to its slow light effect. However, the wavelength in the VHF band is too long to design resonators, and the group delay is limited by the high resistive loss of metal. The practical application of EIT in the VHF band is still a big challenge. In this work, we propose and experimentally demonstrate EIT response in a high-temperature superconducting (HTS) microwave circuit with coupled-resonator-induced transparency. The chip size of the HTS circuit is only 34 mm×20 mm with a very low transparency frequency of 198.55 MHz. In addition, we implement very large group delay higher than 12.3 μs and 16.2 μs with working temperatures of 65 K and 50 K separately, which is much longer than the previous reported works on slow wave. The fabricated circuit is planar with working temperature about 65 K, and thus can be easily integrated into other microwave devices under the cryogenic conditions provided by a commercial portable Stirling cryocooler. Our proposed method paves a way for studying EIT in the microwave region due to the high quality factor of the HTS resonator, which has great potential use for radio-frequency memory in the future.
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    ng=clφω.

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    Tianning Zheng, Bin Wei, Fuchuan Lei, Bisong Cao. Very large group delay in VHF band using coupled high temperature superconducting resonators[J]. Photonics Research, 2021, 9(10): 1892
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