Abstract
We report on a Stirling-cooled compact intrinsic Josephson-junction stack with very high critical current density and improved cooling, operating at bath temperatures up to 86 K. The square stand-alone stack is embedded between two sapphire substrates. For bath temperatures between 27.8 and 86 K emission is observed at frequencies from 0.356 to 2.09 THz. The emission power exceeds at bath temperatures between 60 and 80 K for emission frequencies between 0.5 and 0.88 THz. A record high value of 0.577 THz is obtained for the emission frequency at , which is important for potential applications using liquid nitrogen as a coolant. We also compare our experimental results with numerical simulations based on three-dimensional coupled sine-Gordon equations combined with heat diffusion equations.
- Received 26 April 2018
DOI:https://doi.org/10.1103/PhysRevApplied.10.024041
© 2018 American Physical Society