Preparation of High-quality Bi-2223 Single Crystal Thin Film for Intrinsic Josephson Junctions used in THz Emission

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Terahertz electromagnetic waves are expected to be applied for "safety and security" devices such as detectors of cancer cells and non-destructive inspection tools instead of X-rays. The theory on terahertz coherent emission from intrinsic Josephson junctions has been proposed and recently demonstrated for bulk crystals of Bi-2212 superconducting materials. However, the intensity of emission is weak for practical use. In order to solve the "low intensity problem" new device structures using thin films are proposed. To approach and demonstrate this idea, high-quality non c-axis oriented Bi-2223 thin films are prepared by metalorganic chemical vapor deposition.