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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tobar, Michael
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2024Conductivity freeze-out in isotopically pure Si -28 at millikelvin temperaturescitations
- 2019Experimental implementations of cavity-magnon systemscitations
- 2019Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28citations
- 2018Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators
- 2018Cavity magnon polaritons with lithium ferrite and three-dimensional microwave resonators at millikelvin temperaturescitations
- 2016A 3D printed superconducting aluminium microwave cavitycitations
- 2016Ultrahigh cooperativity interactions between magnons and resonant photons in a YIG spherecitations
- 2015Discovery of iron group impurity ion spin states in single crystal Y2SiO5 with strong coupling to whispering gallery photonscitations
- 2007Dependence of the dielectric permittivity of single-crystal quartz on thermal deformation at cryogenic temperaturescitations
- 2004The dual-mode frequency-locked technique for the characterisation of the temperature coefficient of permittivity of ainsotropic materialscitations
- 2004Whispering-Gallery Mode Technique Applied to the Measurement of the Dielectric Properties of Langasite Between 4 K and 300 K
- 2004Measurement of the strain-induced coefficient of permittivity of sapphire using whispering gallery modes excited in a high-Q acoustic sapphire oscillatorcitations
- 2001Whispering Gallery Method of Measuring Complex Permittivity in Highly Anisotropic Materials: Discovery of a New Type of Mode in Anisotropic Dielectric Resonatorscitations
- 2000Microwave characterisation of BaCe2Ti5O15 and Ba5Nb4O15 ceramic dielectric resonators using whispering gallery mode methodcitations
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document
Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators
Abstract
<p>Single crystal isotopically pure 28Si cylindrical Whispering Gallery (WG) mode resonators have been machined from a rod of isotopically pure crystal. Before machining, the rod was loaded into a cavity with the best Bragg confined modes exhibiting Q-factors above a million for frequencies between 10 and 15 GHz. Electron Spin Resonance spectroscopy revealed a very narrow linewidth spin transition, with g-factor of 1.995±0.008. Analysis determined an upper limit to the linewidth of 7 kHz and a concentration of less than 10<sup>11</sup> spins/cm<sup>3</sup> (10 parts per trillion). After machining into WG mode resonators, the measured frequencies of the fundamental mode families were used to determine the relative permittivity of the material near 4 K and 20 mK to be 11.488±0.024, with the precision limited only by the dimensional accuracy of the resonator. However, the Q-factors were degraded to below 40,000. Raman spectroscopy revealed strain induced broadening on the radial surface of the crystal as a result of the machining. After an acid clean and etch, followed by annealing, the surface damage was repaired. Subsequently, high Q-factors were also restored. The next step will be to purposefully implant ions to try and realise narrow linewidth spin ensembles with clock transitions, which will couple to high-Q WG modes inside the crystal.</p>