Dynamic surface profiling with synthetic holographic confocal microscopy

M. Schnell, P. S. Carney, R. Hillenbrand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present mapping of the vibration modes of an atomic force microscope cantilever with quantitative phase-resolved confocal microscopy. To this end, we combine synthetic optical holography with fast light detection at MHz frequencies to produce three-dimensional data sets, from which we reconstruct time-resolved amplitude and phase maps. Excitation at a single frequency and subsequent demodulation of the data yields the mode structure of the selected (vertical) oscillation mode. We also present a spectroscopic imaging modality, where broadband pulses simultaneously excite a variety of vibration modes from 40 kHz to 1 MHz that are all mapped in a single image acquisition in five minutes time. Our method is technically simple and fast because special modulated light sources as employed in stroboscopic methods for vibrational mapping are not needed, rather the maximum resolvable frequency is determined by the response time of the photodetector. We thus envision our technique for the measurement of mechanical vibration modes of micromechanical systems at up to GHz frequencies.

Original languageEnglish (US)
Title of host publicationFrontiers in Optics, FiO 2016
PublisherOSA - The Optical Society
ISBN (Print)9781943580194
DOIs
StatePublished - Jul 21 2014
EventFrontiers in Optics, FiO 2016 - Rochester, United States
Duration: Oct 17 2016Oct 21 2016

Publication series

NameOptics InfoBase Conference Papers

Conference

ConferenceFrontiers in Optics, FiO 2016
Country/TerritoryUnited States
CityRochester
Period10/17/1610/21/16

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials

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