A research group consisting of Associate Professor Kazuhiro Kaketani of the Graduate School of Engineering, Kyoto University, Dr. Asem M Arabi, and Assistant Professor Tsujimoto of the University of Tsukuba has succeeded in developing a terahertz light source that enables ultra-high density mobile communication. For the first time in the world, we succeeded in radiating circularly polarized electromagnetic waves from a high-temperature superconducting device.The technology realized this time enables stable ultra-high-density mobile data transmission regardless of the posture of the receiving side, and can be applied to automatic driving of automobiles and the like.
Electromagnetic waves in the terahertz band are expected to be applied to a wide range of fields such as high-speed wireless communication, airport security checks, identification of cancer sites, and drug detection in envelopes.A light source that continuously oscillates terahertz waves (using the nanostructure of a high-temperature superconductor) was invented in 2007, and since then, research has been conducted all over the world with the aim of putting this light source into practical use.
This time, the group created a superconducting terahertz light source in the shape of a square cut off the diagonal, and succeeded in radiating a terahertz wave with "circular polarization characteristics" in which the electric field of the electromagnetic wave rotates.Surprisingly, this circularly polarized terahertz wave can be emitted by simply connecting a commercially available AA battery.Also, unlike the conventional terahertz light source that requires complicated adjustment, the superconducting terahertz light source has a simple one-plate structure based on the original crystal structure of the substance, and is rich in durability and mass productivity.Furthermore, it seems that it can operate even at extremely low temperatures of minus 1 ° C.For these reasons, portable applications have also been proposed.
Paper information:[Physical Review Applied] Monolithic Superconducting Emitter of Tunable Circularly Polarized Terahertz Radiation
