High-Q silica microsphere by poly(methyl methacrylate) coating and modifying

2010 
We experimentally characterize the Q-factor in a silica microsphere with the poly(methyl methacrylate) coating. Experimental results demonstrated that the Q-factor of the coated microcavity is higher than 108. Moreover, this coating is able to eliminate scattering from the unsmoothed surface and tune the optical field in the cavity. In the cavity interaction with quantum dots, the coating can not only increase the Q-factor of the microsphere with deposited quantum dots but also draw the maximal field to the interface where the quantum dots exist. Therefore, this coating method can highly enhance the interaction strength, and it will contribute to the cavity quantum electrodynamics study.
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