Journal
OPTICS EXPRESS
Volume 24, Issue 14, Pages 16010-16015Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.016010
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- Ministry of Science and Technology, Taiwan [MOST 104-2112-M-001]
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We report the correlation between inner morphology, size and whispering gallery mode (WGM) behavior in ZnO microspheres (MSs) grown by hydrothermal method. WGMs in different ZnO microspheres with diameters in the range of 2 - 6 mu m were analyzed by a modified refractive index (MRI) scheme. We found that the size dependence of WGMs in our system is more complicated than others because of the appearance of porosity inside each sphere. Such features might account for the refractive index change and peak shift. Despite that, our MRI scheme can detect such complex features and reproduce universal relations between all important quantities of a microsphere WGM resonator. (C) 2016 Optical Society of America
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