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Enhanced optical axial confinement in asymmetric microtube cavities rolled up from circular-shaped nanomembranes
Vladimir A Bolaños Quiñones1, Libo Ma, Shilong Li
1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany.
Optics Letters
|October 18, 2012
Abstract:
Asymmetric cone-like microtube cavities have been fabricated by unevenly rolling-up prestrained SiO/SiO(2) circular-shaped nanomembranes. Spatially localized axial resonant modes are obtained due to an axial confinement mechanism that is defined by the variation of the tube radius and windings along the tube axis. A theoretical model is applied to quantitatively explain and confirm our experimental results.
