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A Bragg resonator uses dielectric plates within a metallic cavity to confinethe energy within a central free space region. The importance of thepermittivity is shown with a better Q-factor possible using higher permittivitymaterials of larger intrinsic dielectric losses. This is because the electricenergy in the reflectors decreases proportionally to the square root ofpermittivity and the coupling to the metallic losses decrease linearly. In asapphire resonator with a single reflector pair a Q-factor of 2.34x10^5 isobtained, which may be improved on by up to a factor of 2 using higherpermittivity materials.

Low-loss Materials for high Q-factor Bragg Reflector Resonators