Projects per year
A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coating nowadays. The approach is demonstrated for chromium, chromium/gold, and multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10-5 near 30 MHz at 4 K. The results are compared to the previous measurements.
1/01/16 → 31/12/18
Milburn, G., White, A., Doherty, A., Tobar, M., Twamley, J., Bartlett, S., Biercuk, M., Bowen, W., Brennan, G., Duty, T., Gilchrist, A., Molina-Terriza, G., Rabeau, J., Reilly, D., Rubinsztein-Dunlop, H., Stace, T. & Vidal, G.
1/01/11 → 31/12/17