ROW: Fabrication of High Tc Superconductor Thin-Film Micro- bridges for Millimeter-Wave Detection and Mixing

PI将制备高转变温度的薄膜 通过沉积到冷却的衬底上。 反应溅射和热 氧气喷射溅射制造技术将被用来生产 制备了高质量的YBa_2Cu_3 O_（7-x）薄膜。 在最初的 研究了合金的成分、显微组织和直流电性能 特性，这些薄膜将被图案化成可变厚度 用于毫米波检测和混频应用的微桥。 将特别强调制造的可重复性 过程，因为它适用于转变温度，临界电流， 和辐射下的性质。 在调查的第二阶段，微桥将被 用作毫米波范围内的外差探测器。 We have in 我们的实验室收集了大量的有源器件（源， 振荡器、检测器、混频器、隔离器）和无源元件， 94 GHz范围。 第一个目标是研究微波 通过在该温度下用RF源泵浦 频率. 然后，微桥将作为混频器操作。 的 转换效率和混频器噪声将被测量。

The PI will prepare high-transition temperature superconductive films by deposition onto cooled substrates. Reactive sputtering and hot oxygen jet sputter fabrication techniques will be employed to produce as-deposited high-quality YBa2Cu3O7-x thin-films. After the initial investigation of the composition, microstructure and the DC electrical properties, these films will be patterned into variable thickness microbridges for millimeter-wave detection and mixing applications. Special emphasis will be given to the repeatability of the fabrication process as it applies to the transition temperature, critical current, and properties under radiation. In the second stage of the investigation, the microbridges will be used as heterodyne detectors in the millimeter-wave range. We have in our laboratories a good collection of active devices (sources, oscillators, detectors, mixers, isolators) and passive components in the 94 GHz range. The first goal will be to investigate the microwave properties of the microbridges by pumping with an rf source at this frequency. Then the microbridge will be operated as a mixer. The conversion efficiency, and mixer noise will be measured.