W-band Lumped Element Kinetic Inductance Detector Array for Large Ground-Based Telescopes
W-band Lumped Element Kinetic Inductance Detector Array for Large Ground-Based Telescopes
复制标题
用于大型地基望远镜的 W 波段集总元件动感电感探测器阵列
DOI：
--
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
F. Piacentini
中科院分区：
文献类型：
--
作者：
A. Coppolecchia;A. Paiella;L. Lamagna;G. Presta;E. Battistelli;P. Bernardis;M. Castellano;F. Columbro;S. Masi;L. Mele;G. Pettinari;F. Piacentini
我们描述了一个W波段集总元件动态电感探测器阵列的发展应用在大型地面望远镜，如撒丁岛射电望远镜。基于以前的研究，我们使用Ti/Al双层膜（10 nm厚的Ti $ + 25 nm厚的Al）的谐振器，覆盖频率大于65 GHz。已经使用ANSYS HFSS软件套件进行了光学模拟，以优化吸收体的几何形状、照明配置和电介质基板的厚度。模拟结果表明，最佳的吸收体结构为前照式三阶希尔伯特曲线结构，硅基片厚度为235 μ m，耦合到单模圆波导上.使用SONNET进行了电气仿真，通过选择电容器的大小，偏置耦合和馈线来完成检测器的设计。此外，电气模拟允许我们验证集总条件，调整馈线阻抗和谐振频率，约束耦合品质因数，并最大限度地减少同一阵列的不同像素之间的电气串扰。
We describe the development of a W-band lumped element kinetic inductance detector array for application in large ground-based telescopes, like the Sardinia radio telescope. Based on the previous studies, we use a Ti/Al bi-layer film (10 nm thick Ti $$+$$ + 25 nm thick Al) for the resonators, to cover frequencies greater than 65 GHz. Optical simulations have been performed using ANSYS HFSS software suite, to optimize the absorber geometry, the illumination configuration, and the thickness of the dielectric substrate. Simulations suggest that the best geometry of the absorber is a front-illuminated third-order Hilbert curve, with a Si substrate $${235},{upmu hbox {m}}$$ 235 μ m thick, coupled to a single-mode circular waveguide. Electrical simulations have been performed using SONNET, to complete the design of the detectors by choosing the size of the capacitor, the bias coupling, and the feedline. In addition, the electrical simulations allow us to verify the lumped condition, to tune the feedline impedance and resonant frequencies, to constrain the coupling quality factor, and to minimize the electrical cross-talk between different pixels of the same array.