Fluxon Dynamics of High-TC superconductor and device application for THz wave.

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Bi_2Sr_2CaCu_2O_8(Bi-2212) High-T_C superconductor intrinsic Josephson junction(IJJ) is a promising candidate of intense terahertz emitting device. At present, elucidation of the interaction between the traveling fluxons and electromagnetic wave in the junction (Josephson plasma modes) are key to succeed in the terahertz emissions. In this research, we have elucidated (1) Antenna integration effects on flux-flow properties of Bi-2212 IJJ, (2) Excitation phenomena of plasma resonance mode of Bi-2212 IJJ by flux-flow, and demonstrated (3) Terahertz plasma resonance emission from current-injected Bi-2212 IJJ. In addition to above mentioned results, we have comprehensively studied carrier control of Bi-2212 single crystal which dominates junction parameters of Bi-2212 IJJ. As the result, we have found that a partial substitution of Ca site by Y can controls carrier concentration with no degradation in T_C.