3 years ago

# Monolithic superconducting emitter of tunable circularly polarized terahertz radiation.

M. Tsujimoto, I. Kakeya, A. Elarabi, Y. Yoshioka

We propose an approach to control the polarization of terahertz (THz) radiation from intrinsic Josephson-junction stacks in single crystalline high-temperature superconductor $Bi_2Sr_2CaCu_2O_{8+\delta}$. By monolithically controlling the surface current distributions in the truncated square mesa structure, we can modulate the polarization of the emitted THz wave as a result of two orthogonal fundamental modes excited inside the mesa. Highly polarized circular terahertz waves with a degree of circular polarization of more than 99% can be generated using an electrically controlled method. The emitted radiation has a high intensity of $30 nW/cm^2$ and a low axial ratio (AR<1 dB). The intuitive results obtained from the numerical simulation based on the conventional antenna theory are consistent with the observed emission characteristics.

Publisher URL: http://arxiv.org/abs/1711.01375

DOI: arXiv:1711.01375v1

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