High quality factor manganese-doped aluminum lumped-element kinetic inductance detectors sensitive to frequencies below 100 GHz
- Columbia Univ., New York, NY (United States). Dept. of Physics
- Cardiff Univ., Cardiff, Wales (United Kingdom). School of Physics and Astronomy
- Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
- Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Southern California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
- Stanford Univ., CA (United States). Dept. of Physics
Aluminum lumped-element kinetic inductance detectors (LEKIDs) sensitive to millimeter-wave photons have been shown to exhibit high quality factors, making them highly sensitive and multiplexable. The superconducting gap of aluminum limits aluminum LEKIDs to photon frequencies above 100 GHz. Manganese-doped aluminum (Al-Mn) has a tunable critical temperature and could therefore be an attractive material for LEKIDs sensitive to frequencies below 100 GHz if the internal quality factor remains sufficiently high when manganese is added to the film. To investigate, we measured some of the key properties of Al-Mn LEKIDs. A prototype eight-element LEKID array was fabricated using a 40 nm thick film of Al-Mn deposited on a 500 μm thick high-resistivity, float-zone silicon substrate. The manganese content was 900 ppm, the measured Tc = 694 ± 1mK, and the resonance frequencies were near 150 MHz. Using measurements of the forward scattering parameter S21 at various bath temperatures between 65 and 250 mK, we determined that the Al-Mn LEKIDs we fabricated have internal quality factors greater than 2 × 105, which is high enough for millimeter-wave astrophysical observations. In the dark conditions under which these devices were measured, the fractional frequency noise spectrum shows a shallow slope that depends on bath temperature and probe tone amplitude, which could be two-level system noise. In conclusion, the anticipated white photon noise should dominate this level of low-frequency noise when the detectors are illuminated with millimeter-waves in future measurements. The LEKIDs responded to light pulses from a 1550 nm light-emitting diode, and we used these light pulses to determine that the quasiparticle lifetime is 60 μs.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- Grant/Contract Number:
- AC02-76SF00515; 1509211; 1509078; 1506074
- OSTI ID:
- 1369427
- Journal Information:
- Applied Physics Letters, Vol. 110, Issue 22; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Development of Multi-chroic MKIDs for Next-Generation CMB Polarization Studies
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journal | July 2018 |
Design and performance of dual-polarization lumped-element kinetic inductance detectors for millimeter-wave polarimetry
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journal | February 2018 |
Ultrastable millimeter-wave kinetic inductance detectors
|
journal | January 2020 |
Development of Multi-Chroic MKIDs for Next-Generation CMB Polarization Studies | text | January 2017 |
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