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

PI将通过沉积在冷却的衬底上制备高转变温度的超导薄膜。反应溅射和热氧喷射溅射制备技术将用于制备高质量的沉积YBa2Cu3O7-x薄膜。在对其组成、微观结构和直流电性能进行初步研究后，这些薄膜将被制成可变厚度的微桥，用于毫米波检测和混频应用。特别强调的是制造过程的可重复性，因为它适用于转变温度、临界电流和辐射下的性能。在研究的第二阶段，微桥将被用作毫米波范围内的外差探测器。我们在实验室中收集了94 GHz范围内的有源器件（源，振荡器，检测器，混频器，隔离器）和无源元件。第一个目标将是通过在该频率上用射频源泵浦来研究微桥的微波特性。然后微桥将作为混合器操作。将测量转换效率和混频器噪声。

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.