title: Tellurite microspheres for nanoparticle sensing and novel light sources.
abstract: High index Er-Yb codoped tellurite spheres with diameter of 9 μm and good sphericity were fabricated using a CO(2) laser. Upconversion modulated whispering gallery modes with a quality factor of 45,000 were observed in the sphere dipped in methanol. Refractometric sensing with detection sensitivity of 7.7 nm/RIU was demonstrated using a 9 μm diameter sphere. Such high index spheres have the potential to be used for nanoparticle sensing and mid-IR frequency conversion.
authors.forename: Yinlan
authors.initials: Y
authors.lastname: Ruan
authors.forename: Keiron
authors.initials: K
authors.lastname: Boyd
authors.forename: Hong
authors.initials: H
authors.lastname: Ji
authors.forename: Alexandre
authors.initials: A
authors.lastname: Francois
authors.forename: Heike
authors.initials: H
authors.lastname: Ebendorff-Heidepriem
authors.forename: Jesper
authors.initials: J
authors.lastname: Munch
authors.forename: Tanya M
authors.initials: TM
authors.lastname: Monro