Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 33, Issue 9, Pages 1993-1999Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.33.001993
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A serially coupled double microsphere resonator is investigated to reduce the nonfundamental resonances and therefore expand the resonance frequency spacing in microsphere resonator systems. Coupled-mode theory is used to model the system and investigate the resonator parameters as coupling efficiency. As a result, it is shown that the nonfundamental resonances in the output spectrum of a single 225 mu m microsphere are reduced noticeably and therefore its minimum resonance frequency spacing is expanded from 5.2 pm to 0.6 nm by serially coupling to a 50 mu m radius microsphere. Furthermore, it is shown that the quality factor of this resonator can reach 2.14 x 10(8), which is on the same order of a single 225 mu m microsphere resonator. The model is verified by comparing the results of the model with the experimental results published by other groups to investigate induced transparency in the coupling of two microspheres. (C) 2016 Optical Society of America
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