^^Abstract^^
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.