0.43 THz emission from high-Tcsuperconducting emitters optimized at 77 K
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-12-11 |
| Journal | Journal of Physics Condensed Matter |
| Authors | Hidetoshi Minami, Chiho Watanabe, Takanari Kashiwagi, Takashi Yamamoto, Kazunori Kadowaki |
| Institutions | University of Central Florida, Center for Integrated Quantum Science and Technology |
| Citations | 19 |
Abstract
Section titled āAbstractāA liquid helium-free, compact and continuous sub-terahertz radiation system operating at 77 K has been developed using a rectangular mesa device made from a high T(c)-superconducting Bi2Sr2CaCu2O(8+Ī“) single crystal, based on a different design of a stand-alone mesa sandwich structure to reduce the dc-current Joule heating effects. The mesa was thermally connected to sapphire plates through thin thermal grease embedded with diamond nano-crystals. When immersed in liquid N 2, the device emits intense radiation at 0.437 THz, the highest frequency ever achieved at 77 K, due to excitation of the TM(1, 0) rectangular cavity mode. By varying the dc current-voltage bias and the bath temperature in a He-flow cryostat, the deviceās emission frequency is broadly tunable from 0.31 THz at 79 K to 1.31 THz at 30 K.