About the role of phase matching between a coated microsphere and a tapered fiber: experimental study

Davor Ristic (1) , Alphonse Rasoloniaina (2) , Andrea Chiappini (3) , Patrice Féron (2) , Stefano Pelli (4) , Gualtiero Nunzi-Conti (4) , Mile Ivanda (5) , Giancarlo C. Righini (4) , Gilles Cibiel (6) , Maurizio Ferrari (3)

1 IFN - CNR Institute for Photonics and Nanotechnologies
2 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
3 CSMFO - Caratterizzazione e Sviluppo di Materiali per la Fotonica e l'Optoelecttronica
4 IFAC - Istituto di Fisica Applicata "Nello Carrara"
5 Rudjer Boskovic Institute [Zagreb]
6 CNES - Centre National d'Études Spatiales [Toulouse]

Coatings of spherical optical microresonators are widely employed for different applications. Here the effect of the thickness of a homogeneous coating layer on the coupling of light from a tapered fiber to a coated microsphere has been studied. Spherical silica microresonators were coated using a 70SiO2 - 30HfO2 glass doped with 0.3 mol% Er3+ ions. The coupling of a 1480 nm pump laser inside the sphere has been assessed using a tapered optical fiber and observing the 1530-1580 nm Er3+ emission outcoupled to the same tapered fiber. The measurements were done for different coating thicknesses and compared with theoretical calculations to understand the relationship of the detected signal with the whispering gallery mode electric field profiles.

Mots clés: Deposition and fabrication; Microcavities; Rare-earth-doped materials; Optical properties; Photoluminescence

Domaines: Optique [physics.optics]

Davor Ristic, Alphonse Rasoloniaina, Andrea Chiappini, Patrice Féron, Stefano Pelli, et al.. About the role of phase matching between a coated microsphere and a tapered fiber: experimental study. Optics Express, 2013, 21 (18), pp.20954. ⟨10.1364/OE.21.020954⟩. ⟨hal-00997090⟩