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Opt Express. 2012 Aug 13;20(17):18555-67. doi: 10.1364/OE.20.018555.

Tubular oxide microcavity with high-index-contrast walls: Mie scattering theory and 3D confinement of resonant modes.

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Department of Materials Science, Fudan University, Shanghai 200433, China.


Tubular oxide optical microcavities with thin walls (< 100 nm) have been fabricated by releasing pre-stressed Y2O3/ZrO2 bi-layered nanomembranes. Optical characterization demonstrates strong whispering gallery modes with a high quality-factor and fine structures in the visible range, which are due to their high-index-contrast property (high refractive index in thin walls). Moreover, the strong axial light confinement observed in rolled-up circular nanomembranes well agrees with our theoretical calculation by using Mie scattering theory. Novel material design and superior optical resonant properties in such self-rolled micro-tubular cavities promise many potential applications e.g. in optofluidic sensing and lasing.

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