Temperature-stable and high Q-factor TiO2 Bragg reflector resonator

Breeze, J., Krupka, J., Centeno, A. and Alford, N. M. (2009) Temperature-stable and high Q-factor TiO2 Bragg reflector resonator. Applied Physics Letters, 94(8), 082906. (doi: 10.1063/1.3086877)

Full text not currently available from Enlighten.


The highest Q Q -factor resonators employ whispering gallery modes in single-crystal sapphire but have poor temperature stability. Rutile was the first dielectric material used to construct a microwave dielectric resonator. However, its very high temperature coefficient of permittivity made it unsuitable for practical applications. This paper reports a high Q Q -factor (50 000) and temperature-stable spherical Bragg reflector resonator based on polycrystalline rutile operating at 29.9 GHz. Temperature stability is achieved by adjusting the electric filling factor of a spherical shell so that in combination with its highly negative temperature coefficient of permittivity, the effect of thermal expansion is exactly cancelled out. The authors acknowledge support from the Engineering and Physical Sciences Research Council.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Centeno, Dr Anthony
Authors: Breeze, J., Krupka, J., Centeno, A., and Alford, N. M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Applied Physics Letters
Publisher:American Institute of Physics
ISSN (Online):1077-3118
Published Online:27 February 2009
Related URLs:

University Staff: Request a correction | Enlighten Editors: Update this record