Title
Tunable Microcavities In Photonic Bandgap Yarns and Optical Fibers: A new generation of fiberbased optical components enabled b,Used
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The vision behind this work is the fabrication of high performance innovative fiberbased optical components over kilometer lengthscales. Their optical properties derive from their multilayer dielectric photonic bandgap structure that exhibits omnidirectional reflectivity. The theoretical tools needed to design, analyze and optimize such structures are introduced. We show that defect layers in these otherwise periodic structures act as microcavities that enable precise design of the fibers' spectral response. Two structures are explored: fibers for external reflection and hollow core transmission fibers. We demonstrate that the resonance wavelength of FabryPerot cavities embedded in reflecting fibers can be tuned reversibly under applied elastic strain or external illumination at 514 nm. Experimental data is compared to computed data based on optomechanical and photodarkening models. We then show that optical microcavities in transmission fibers can induce significant groupvelocity dispersion as a result of modal interactions. Applications for these fibers and future research directions are envisioned.
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