Complex permittivity of some ultralow loss dielectric crystals at cryogenic temperatures
Open accessAbstract
Whispering gallery modes were used for very accurate permittivity and dielectric loss measurements of ultralow loss isotropic and uniaxially anisotropic single crystals. Several materials including sapphire, YAG, quartz, and SrLaAlO 4 were measured. The total absolute uncertainty in the real part of permittivity tensor components was estimated to be ±0.1%, limited principally by the uncertainty in sample dimensions. Imaginary parts of permittivities were measured with uncertainties of about 10%, limited by the accuracy of Q -factor measurements of whispering gallery modes. It has been observed that, for most crystals, dielectric losses can be approximated by a power function of absolute temperature only in limited temperature ranges. At temperatures between 4-50 K, losses are often affected by impurities, which are always present in real crystals.
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Dielectric losses are very low for materials such as sapphire, with a loss tangent of ∼4×10^-8 at 4 K.
“These are very low for materials such as sapphire, with a loss tangent of ∼4 × 10 -8 at 4 K [38].”
From Single Microwave Photon Detection with a Trapped Electron (2016) · cites this paper as [38]
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References 20 · Cited by 315
- Authors
- Krupka, J., Derzakowski, K., Tobar, M., Hartnett, J., & Geyer, R. G.
- Affiliations
- The University of Western Australia (AU)
- National Institute of Standards and Technology (US)
- Venue
- Measurement Science and Technology
- Publisher
- IOP Publishing
- Published
- 1999-01-01
- Volume
- 10
- Issue
- 5
- Pages
- 387-392
- ISSN
- 0957-0233 (ISSN-L)
- 1361-6501
- OpenAlex
- W2080382336
- Cited by
- 315
- References
- 20
- Citations by year
- 2026: 9 · 2025: 12 · 2024: 15 · 2023: 15 · 2022: 20 · 2021: 23 · 2020: 13 · 2019: 8 · 2018: 11 · 2017: 13 · 2016: 15 · 2015: 11 · 2014: 12 · 2013: 10 · 2012: 13
- FWCI
- 9.76
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Measurement Science and Technology (publishedVersion)
- UWA Profiles and Research Repository (UWA) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Microwave and Dielectric Measurement Techniques
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Electrical and Electromagnetic Research
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Scientific Measurement and Uncertainty Evaluation
- Keywords
- complex permittivity, dielectric loss, single crystals, whispering gallery modes, cryogenic temperatures, sapphire, yttrium aluminum garnet, quartz, SrLaAlO4, uniaxial anisotropy, temperature dependence of losses, impurities, quality factor
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