We have developed a new technique for accurate measurement of the loss of superconducting microstrips at mm-wave frequencies. In this technique, we optically couple power to slot antenna, which is connected to one port of a hybrid coupler. One of the output ports of the hybrid delivers power to a series of mm-wave microstrip resonators which are capacitively coupled to a feedline followed by an...

Superconducting boron-doped silicon is a promising material for integrated quantum devices. In particular, its low electronic density and moderate disorder make it suitable candidate the fabrication of large inductances with losses at microwave frequencies. We study experimentally electrodynamics superconducting thin layers using coplanar waveguide resonators, focusing on kinetic inductance, in...

Microwave circuit electrodynamics of disordered superconductors is a very active research topic spawning wide range experiments and applications. For compact superconducting elements, the transition to an insulating state poses limit maximum attainable kinetic inductance. It is, therefore, vital study fundamental noise properties thin films close this transition, particularly in situations wher...

One of the advantages kinetic inductance detectors is their intrinsic frequency domain multiplexing capability. However, fabrication imperfections usually give rise to resonance deviations, which create collision and limit array yield. Here, we study deviation a 4-in. kilo-pixel lumped-element detector (LEKID) using optical mapping. Using measured resonator dimensions film thickness, fractional...

Boron-doped diamond granular thin films are known to exhibit superconductivity with an optimal critical temperature of Tc=7.2 K. Here, we report the measured in-plane complex surface impedance boron-doped in microwave frequency range using a resonant technique. Experimentally inductance values good agreement estimates obtained from normal state sheet resistance material. The magnetic penetratio...

The kinetic inductance of charge carriers in disordered superconductors provides a broadband low-loss source nonlinear electromagnetic response. This work investigates TiN nanowires as an alternative to Josephson junctions for applications involving elevated temperatures, higher frequencies, and strong magnetic fields. An extreme nanowire geometry microwave resonators leads current-density conc...

We demonstrate strong negative electrothermal feedback accelerating and linearizing the response of a thermal kinetic inductance detector (TKID). TKIDs are proposed highly multiplexable replacement to transition-edge sensors measure power through temperature-dependent resonant frequency superconducting microresonator bolometer. At high readout probe detuned from TKID frequency, we observe loop ...