Optimization of the THz radiation from superconductor at non-laminar regime

• The terahertz radiation of a mesa structure at non laminar regime is considered here.
• The non-laminarity of this media is modeled.
• The equation of vortex motion and electromagnetic field is solved.
• The radiated power is obtained and the parameter optimization for maximize the radiated power is done.

The THz radiation due to the flux flow in a superconductor slab at non-laminar regime has been investigated and the radiated power spectrum has been calculated. The parameter (τ) is defined to show amount of non-laminarity. The results reveal that for small values of τ, the system radiated at the harmonics of famous washboard frequency. However, for large values of τ, the radiation spectrum will be changed and for extreme values of τ, the peaks will be flat. Therefore the washboard picture is not valid anymore. The results show that the radiation power is optimum for the special value of τ. Also, the results compared with other theoretical and experimental data.