Monolithic superconducting emitter of tunable circularly polarized terahertz radiation
| Autor: | Elarabi, A., Yoshioka, Y., Tsujimoto, M., Kakeya, I. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 8, 064034 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.8.064034 |
| Popis: | 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 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. Comment: Submitted to PRApplied |
| Databáze: | arXiv |
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