High Quality Factor Platinum Silicide Microwave Kinetic Inductance Detectors

Abstract

We report on the development of Microwave Kinetic Inductance Detectors (MKIDs) using platinum silicide as the sensor material. MKIDs are an emerging superconducting detector technology, capable of measuring the arrival times of single photons to better than two microseconds and their energies to around ten percent. Previously, MKIDs have been fabricated using either sub-stoichiometric titanium nitride or aluminum, but TiN suffers from spatial inhomogeneities in the superconducting critical temperature and Al has a low kinetic inductance fraction, causing low detector sensitivity. To address these issues, we have instead fabricated PtSi microresonators with superconducting critical temperatures of 944$\pm$12~mK and high internal quality factors ($Q_i\gtrsim 10^6$). These devices show typical quasiparticle lifetimes of ${\tau }_{qp}\approx 30$--$40\mu$s and spectral resolution, $R=\lambda /\Delta \lambda$, of 8 at 406.6~nm. We compare PtSi MKIDs to those fabricated with TiN and detail the substantial advantages that PtSi MKIDs have to offer.

5 pages, 5 figures, accepted by APL

References in corpus (2)

• Experimental evidence for a surface distribution of two-level systems in superconducting lithographed microwave resonators
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition

Cited by in corpus (4)

• Large-format platinum silicide microwave kinetic inductance detectors for optical to near-IR astronomy
• Design and Performance of Hafnium Optical and Near-IR Kinetic Inductance Detectors
• Superconducting MoSi nanowires
• Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates