Klein, AngelaAngelaKleinSchmidt, CarstenCarstenSchmidtLiebsch, MattesMattesLiebschJanunts, NorikNorikJanuntsDobynde, MikhailMikhailDobyndeTünnermann, AndreasAndreasTünnermannPertsch, ThomasThomasPertsch2022-03-042022-03-042014https://publica.fraunhofer.de/handle/publica/23552410.1364/OL.39.0011572-s2.0-84897410794We 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.en535journal article