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Fabrication of Lumped Element Microwave Kinetic Inductance Detectors for Ultraviolet to Near-Infrared Astrophysics
Date: Monday, October 1, 2012 Time: 4:00pm Location: 125 Steele, Caltech Speaker: Bruce Bumble
KNI / MDL Joint Seminar
Superconducting microwave resonator arrays offer attractive benefits over conventional semiconductor devices. Quantum efficiency is greatly enhanced by superconducting Cooper Pair energy of only millielectron volts. Each pixel is a lumped element L-C circuit coupled to a single driveline for simple multiplexing. Absorbed photons produce quasiparticle counts proportional to their energy and thus a kinetic inductance and frequency shift. Our work with UCSB has resulted in large-area Microwave Kinetic Inductance Detector arrays of up to 2024 pixels with energy resolution (E /DE) of 16 at 254 nm. The UCSB camera has been used on both the Palomar and Lick Observatories displaying a bandwidth of 400–1100 nm. I will describe the development and fabrication of this device based on a TiN detector and Nb drive line.