Device-Level Noise Physics of SuperSpec’s Extremely Low Volume Titanium Nitride Kinetic Inductance Detectors

25 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector Development and Physics Poster session

Speaker

Jordan Wheeler (University of Colorado - Boulder)

Description

SuperSpec is a new technology for millimeter and submillimeter spectroscopy. It is an on-chip spectrometer being developed for multi-object, moderate resolution, large bandwidth survey spectroscopy of high-redshift galaxies for the 1 mm atmospheric window. SuperSpec targets the CO ladder in the redshift range of z = 0 to 4, the [CII] 158 um line from z = 5 to 9, and the [NII] 205 um line from z = 4 to 7. All together these lines offer complete redshift coverage from z = 0 to 9. SuperSpec employs a novel architecture in which detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. This construction allows for the creation of a full spectrometer occupying as few as several cms squared of silicon, a reduction in size of several orders of magnitude when compared to standard grating spectrometers. This small profile enables the production of future multi-object spectroscopic instruments required as the millimeter-wave spectroscopy field matures.
The SuperSpec filterbank is coupled to the inductive meander of titanium nitride (TiN) kinetic inductance detectors (KIDs), which serve as the power detectors. The unique coupling scheme employed by SuperSpec allows for the creation of extremely low volume (~2.5 cubic microns), high responsivity, TiN KIDs. Since responsivity is proportional to the inverse of quasiparticle-occupied volume, this allows SuperSpec to reach very low NEPs.
We investigate in detail the noise properties of these extreme detectors. In particular, we examine the scaling of both white noise and 1/f noise with respect to array temperature, loading, volume, and superconducting transition temperature (Tc). We will compare these measurements to analytical models for the expected noise levels. Finally, we will additionally present measured time constants for the SuperSpec detectors.

Less than 5 years of experience since completion of Ph.D Y
Student (Ph.D., M.Sc. or B.Sc.) Y

Primary authors

Jordan Wheeler (University of Colorado - Boulder) Steven Hailey-Dunsheath (California Institute of Technology) Joseph Redford (California Institute of Technology) Kirit Karkare (University of Chicago) Dr Matt Bradford (JPL) Jason Glenn (University of Colorado - Boulder) Erik Shirokoff (University of Chicago) Pete Barry (Cardiff University) Henry G. Leduc (Jet Propulsion Laboratory) Phillip Mauskopf (Arizona State University) Ryan McGeehan (University of Chicago) Jonas Zmuidzinas (California Institute of Technology) Reinier Janssen (Jet Propulsion Laboratory) Samuel Gordon (School of Earth and Space Exploration, Arizona State University)

Presentation Materials