In this paper, we introduce a concept of spherical Photonic Crystal (SPhC) Cavity. The cavity is composed of a serial of concentric spherical shells with periodic refractive index. Such a cavity has a strong ability to confine light and energy. Optical quality factor of our structure can achieve 10^9 order. Moreover, a complete three dimension photonic band gap can be obtained due to the spherical symmetry it owns. The result is calculated by Finite-Difference Time-Domain (FDTD) method.
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