title: Tailoring of the free spectral range and geometrical cavity dispersion of a microsphere by a coating layer.
abstract: The modal dispersion of a whispering gallery mode (WGM) resonator is a very important parameter for use in all nonlinear optics applications. In order to tailor the WGM modal dispersion of a microsphere, we have coated a silica microsphere with a high-refractive-index coating in order to study its effect on the WGM modal dispersion. We used Er(3+) ions as a probe for a modal dispersion assessment. We found that, by varying the coating thickness, the geometrical cavity dispersion can be used to shift overall modal dispersion in a very wide range in both the normal and anomalous dispersion regime.
authors.forename: Davor
authors.initials: D
authors.lastname: Ristić
authors.forename: Maurizio
authors.initials: M
authors.lastname: Mazzola
authors.forename: Andrea
authors.initials: A
authors.lastname: Chiappini
authors.forename: Alphonse
authors.initials: A
authors.lastname: Rasoloniaina
authors.forename: Patrice
authors.initials: P
authors.lastname: Féron
authors.forename: Roberta
authors.initials: R
authors.lastname: Ramponi
authors.forename: Giancarlo C
authors.initials: GC
authors.lastname: Righini
authors.forename: Gilles
authors.initials: G
authors.lastname: Cibiel
authors.forename: Mile
authors.initials: M
authors.lastname: Ivanda
authors.forename: Maurizio
authors.initials: M
authors.lastname: Ferrari