Abstract
We have developed a novel but simple approach to obtain ZnO microcombs with parallelogram stems and elongated hexagonal branches. We found that the present elongated hexagonal microcavity exhibited quite different features for its optical resonant modes due to the broken hexagonal symmetry. The resonant mode evolution of such microcavity was investigated systemically by using a spatially resolved spectroscopic technique. Theoretical analyses based on the plane wave mode and FEM simulations agreed well with the experimental results. We believe that our research allows us to have a deeper understanding of the controllable growth of novel optical cavities and the shape-dependent optical resonant modes.
Highlights
We reported the synthesis of the novel single-crystalline Zinc oxide (ZnO) microcombs with parallelogram stems and elongated hexagonal branches, which can effectively control the light field in two dimensions
By using a spatially resolved spectroscopic technique, we directly described the effects of the cross sectional geometry on optical resonant modes experimentally
Cross-whispering gallery mode (WGM) and FPM coexist with different polarizations were observed at the branches of microcombs, which is different with the traditional hexagonal WGM microcavity
Summary
We have developed a novel but simple approach to obtain ZnO microcombs with parallelogram stems and elongated hexagonal branches. Investigation and clarify the effects of the cross sectional geometry on optical resonant modes in microcavity are important and necessary. Most studies on WGM optical resonators are based on the ZnO microwires with regular hexagonal cross section[15,16,17].
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