Open AccessSize and morphology dependent evolution of resonant modes in ZnO microspheres grown by hydrothermal synthesis
Author(s) -
Trong Huynh-Buu Ngo,
Ching-Hang Chien,
Shang-Hsuan Wu,
Yia-Chung Chang
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.016010
Subject(s) - whispering gallery wave , refractive index , hydrothermal circulation , microsphere , morphology (biology) , materials science , resonator , optics , hydrothermal synthesis , porosity , q factor , nanotechnology , optoelectronics , physics , composite material , chemical engineering , biology , engineering , genetics
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 μm 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.