Periodic dielectric structures, such as Bragg reflectors and photonic band-gap crystals, are used to localize electromagnetic modes. A key parameter for electromagnetic resonators is the quality factor, Q. For conventional Bragg reflectors, losses occur predominantly in the first few reflectors and one of the materials usually has a low dielectric loss tangent. By varying the individual dimensions of the reflecting elements, a significant improvement in the Q-factor can be obtained. We verify this by constructing and measuring proof-of-principle microwave resonators.

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