Superconducting On-chip Fourier Transform Spectrometer
R. Basu Thakur (California Institute of Technology, Jet Propulsion, laboratory), N. Klimovich (California Institute of Technology, Jet Propulsion, laboratory), P. K . Day (California Institute of Technology, Jet Propulsion, laboratory), E. Shirokoff (University of Chicago)
TL;DR
This paper introduces a superconducting on-chip Fourier transform spectrometer utilizing nonlinear kinetic inductance in thin film superconductors, enabling compact, tunable spectral analysis at low temperatures.
Contribution
It demonstrates a novel on-chip spectrometer design based on kinetic inductance modulation in superconducting thin films, connecting it with parametric amplification techniques.
Findings
Transmission lines with NbTiN, TiN, NbN show phase velocity control via DC current.
The device enables low-noise, compact spectral measurement.
Potential integration with parametric amplifiers for enhanced performance.
Abstract
Kinetic inductance in thin film superconductors has been used as the basis for low-temperature, low-noise photon detectors. In particular thin films such as NbTiN, TiN, NbN, the kinetic inductance effect is strongly non-linear in the applied current, which can be utilized to realize novel devices. We present results from transmission lines made with these materials, where DC (current) control is used to modulate the phase velocity thereby enabling an on-chip spectrometer. The utility of such compact spectrometers are discussed, along with their natural connection with parametric amplifiers.
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