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0.43 THz emission from high-T(c) superconducting emitters optimized at 77 K.

H Minami1, C Watanabe, T Kashiwagi

  • 1Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan. Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 15, 2015
PubMed
Summary

Researchers developed a compact, liquid helium-free sub-terahertz radiation system using a high-temperature superconductor operating at 77 K. This system achieves the highest frequency (0.437 THz) at this temperature, offering broad tunability.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Terahertz Technology

Background:

  • Traditional terahertz (THz) radiation systems often require liquid helium for cooling, limiting their compactness and practicality.
  • High-temperature superconductors offer potential for THz devices operating at more accessible temperatures.
  • Reducing Joule heating in superconducting devices is crucial for stable and efficient operation.

Purpose of the Study:

  • To develop a compact, continuous-wave sub-terahertz radiation system that operates without liquid helium.
  • To achieve the highest possible emission frequency at 77 K using a superconducting device.
  • To demonstrate broad tunability of the THz emission frequency.

Main Methods:

  • Fabrication of a rectangular mesa device from a high-T(c) superconducting Bi2Sr2CaCu2O(8+δ) single crystal.
  • Implementation of a novel stand-alone mesa sandwich structure to minimize dc-current Joule heating.
  • Thermal connection of the mesa to sapphire plates using thermal grease with embedded diamond nano-crystals.
  • Operation and testing within a liquid nitrogen (77 K) environment and a He-flow cryostat for temperature variation.

Main Results:

  • Successful operation of a liquid helium-free sub-terahertz radiation system at 77 K.
  • Emission of intense radiation at 0.437 THz, the highest frequency reported for a device operating at 77 K.
  • Demonstration of broad frequency tunability from 0.31 THz (at 79 K) to 1.31 THz (at 30 K) by varying bias current and temperature.

Conclusions:

  • The developed system represents a significant advancement in compact and practical THz radiation sources.
  • The novel mesa design effectively reduces Joule heating, enabling higher frequency operation at accessible temperatures.
  • The broad tunability makes this superconducting THz source a promising candidate for various spectroscopic and imaging applications.