| Summary: | 碩士 === 國立中興大學 === 物理學系所 === 99 === This study focus on ultra-small superconducting junctions in two aspects: Firstly, fabrication of single-electron transistors (SET), which serve as charge detectors for sensing the charge number in a box. The sample (SET-array-box) contains two SETs, a one-dimensional Josephson junction array and a box. We measured the current-voltage(IV) characteristics of single electron transistors, and observed Coulomb blockade phenomenon and the oscillatory gating effect on the IV curve by controlling the gate bias. Secondly, we experimentally studied how the microwave propagation affects the one-dimensional Josephson junction (1D JJ) arrays and vice versa. The 1D JJ array is embedded in a coplanar waveguide (CPW), for well-controlling the power and polarization of the guided microwave. From the current-voltage characteristic of the 1D JJ array, we can determine how the superconductivity is destroyed under the excitation of microwave at various powers and frequencies. On the other hand, we found that the microwave transmission can be affected by the array impedance, which is modulated by a magnetic field: The higher impedance the array, the higher microwave transmission.
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