| Terahertz (1THz=1012Hz) wave is located between millimeter wave and infrared, usually refers to the electromagnetic radiation with the frequency range from0.1THz to10THz. Emitter, function devices and detector in this band are the focuses of research. This paper mainly studies the coupling of artificial periodic structures on Tl2Ba2CaCu2O8high-temperature superconducting film and plasma oscillation of Josephson junctions between layer structures of the film. We find that plasma oscillation of Josephson junctions in the film can be coupled with surface plasma model. This result provides a new method to design coupled circuit of high-power Josephson junctions terahertz radiation. In addition, we also study the THz superconducting metamaterial, hope to find new control method of THz radiation. The main research contents include:1. We designed and fabricated periodic sub-wavelength holes, and study the extraordinary optical transmission phenomenon caused by SPP and LSP, which is stimulated by electromagnetic wave. We found that the transmission is temperature dependent. Below the superconducting transition temperature, as the transmission losses reduce, the transmission peak has evident rise. We found SPP can stimulate Josephson junctions plasma oscillation, and oscillation can be coupled to the free space. This result can contribute to the research of good orientation, high-power and tunable solid terahertz radiation source.2. We designed and fabricated some different metamaterial, including ELC electricity resonance structure and EIT electromagnetic induced transparency structure. Measuring results show that superconducting materials ELC structure has good performance of the losses, and we find that transmission and the resonant frequency is temperature dependent. Besides, in the EIT structure, we get the temperature-tuned transparent window. These results make contributions to the active control of terahertz wave. |
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