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We propose a novel whispering gallery mode (WGM) microsphere resonator integrated with a tapered optical fiber. In the proposed structure, the surface of the silica microsphere is coated with a thin layer of Hafnia (Hafnium dioxide). The results from analytical and numerical simulations indicated that the WGMs can be efficiently excited with quality factors, Q, up to 1.9 × 105 in a silica-coated microsphere...
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