title: Highly sensitive mode mapping of whispering-gallery modes by scanning thermocouple-probe microscopy.
abstract: We propose a method for mapping optical near-fields with the help of a thermocouple scanning-probe microscope tip. As the tip scans the sample surface, its apex is heated by light absorption, generating a thermovoltage. The thermovoltage map represents the intensity distribution of light at the sample surface. The measurement technique has been employed to map optical whispering-gallery modes in fused silica microdisk resonators operating at near-infrared wavelengths. The method could potentially be employed for near-field imaging of a variety of systems in the near-infrared and visible spectral range.
authors.forename: Angela E
authors.initials: AE
authors.lastname: Klein
authors.forename: Carsten
authors.initials: C
authors.lastname: Schmidt
authors.forename: Mattes
authors.initials: M
authors.lastname: Liebsch
authors.forename: Norik
authors.initials: N
authors.lastname: Janunts
authors.forename: Mikhail
authors.initials: M
authors.lastname: Dobynde
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
authors.forename: Thomas
authors.initials: T
authors.lastname: Pertsch