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

摘要

We experimentally characterize the Q-factor in a silica microsphere with the polyu0001methylnmethacrylateu0002 coating. Experimental results demonstrated that the Q-factor of the coatednmicrocavity is higher than 108. Moreover, this coating is able to eliminate scattering from thenunsmoothed surface and tune the optical field in the cavity. In the cavity interaction with quantumndots, the coating can not only increase the Q-factor of the microsphere with deposited quantum dotsnbut also draw the maximal field to the interface where the quantum dots exist. Therefore, thisncoating method can highly enhance the interaction strength, and it will contribute to the cavitynquantum electrodynamics study.