title: Interrogation of whispering-gallery modes resonances in cylindrical microcavities by backreflection detection.
abstract: The excitation of whispering-gallery-mode resonances of cylindrical microcavities, using narrow fiber tapers, produces simultaneously the excitation of spiral modes. The power coupled to the spiral modes leads to a significant broadening of the dips observed in the spectrum of light transmitted through the taper. We demonstrate that whispering-gallery modes resonances of cylindrical microcavities can also be interrogated by measuring the reflection spectrum. Unlike the dips observed in transmission, the peaks in the reflection spectrum are symmetric and narrower than the corresponding transmission dips.
authors.affiliation: Departamento de Física Aplicada-Institut Universitari de Ciència dels Materials, Universidad de Valencia, Burjassot, Spain.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Zamora
authors.forename: Antonio
authors.initials: A
authors.lastname: Díez
authors.forename: Miguel V
authors.initials: MV
authors.lastname: Andrés
authors.forename: Benito
authors.initials: B
authors.lastname: Gimeno