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

Appl. Phys. Lett. 94, 082906 (2009); doi:10.1063/1.3086877

Published 27 February 2009

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Jonathan Breeze,1 Jerzy Krupka,2 Anthony Centeno,3 and Neil McN Alford1
1Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
2Department of Electronics, Institute of Microelectronics and Optoelectrics, Warsaw University of Technology, 00-662 Warsaw, Poland
3Centre for Physical Electronics and Materials, London South Bank University, London SE1 0AA, United Kingdom
The highest 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-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. ©2009 American Institute of Physics
History: Received 6 December 2008; accepted 3 February 2009; published 27 February 2009
Permalink: http://link.aip.org/link/?APPLAB/94/082906/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.79.-e
    Optical elements, devices, and systems
  • 85.50.-n
    Dielectric, ferroelectric, and piezoelectric devices
  • 77.22.Ch
    Permittivity (dielectric function)
  • YEAR: 2009

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ISSN:
0003-6951 (print)   1077-3118 (online)
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