Open AccessTellurite microspheres for nanoparticle sensing and novel light sources
Author(s) -
Yinlan Ruan,
Keiron Boyd,
Huihui Ji,
Alexandre François,
Heike Ebendorff-Heidepriem,
J. Münch,
Tanya M. Monro
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.011995
Subject(s) - materials science , spheres , whispering gallery wave , optics , nanoparticle , refractive index , microsphere , integrating sphere , sphericity , photon upconversion , laser , visible spectrum , mie scattering , optoelectronics , nanotechnology , light scattering , luminescence , scattering , physics , resonator , astronomy , chemical engineering , engineering , composite material
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.