Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Dual-wavelength vertical scanning low-coherence interferometric microscope.

Jan Niehues1, Peter Lehmann, Klaus Bobey

  • 1University of Applied Science and Art, Von-Ossietzky-Strasse 99, 37085 Goettingen, Germany. jan.niehues@mahr.de

Applied Optics
|October 13, 2007
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Real-world outcomes of [<sup>177</sup>Lu]Lu-PSMA-I&T in [<sup>18</sup>F]FDG-positive metastatic castration-resistant prostate cancer: factors related to response and survival.

European journal of nuclear medicine and molecular imaging·2026
Same author

Early cAMP signaling orchestrates single-cell synchronicity throughout Dictyostelium development.

Communications biology·2026
Same author

Mutual suppression between mutations in the Dictyostelium Greenbeard pathway restores wild-type development.

BMC genomics·2025
Same author

Author Correction: Global influence of soil texture on ecosystem water limitation.

Nature·2025
Same author

Digital Twins for 3D Confocal Microscopy: Near-Field, Far-Field, and Comparison with Experiments.

Sensors (Basel, Switzerland)·2025
Same author

Going against the family: Perturbation of a greenbeard pathway leads to falsebeard cheating.

iScience·2024
Same journal

Multifunctional reconfigurable terahertz metasurface based on vanadium dioxide phase transition: achieving broadband absorption and efficient polarization conversion.

Applied optics·2026
Same journal

High-Q-factor electromagnetically induced transparency utilizing quasi-bound states in the continuum in an all-dielectric terahertz metasurface.

Applied optics·2026
Same journal

Automated stitching interferometry for high-precision metrology of X-ray mirrors.

Applied optics·2026
Same journal

Experimental demonstration of an approach to designing a metal-dielectric DBR resonant cavity structure.

Applied optics·2026
Same journal

High-precision wavefront reconstruction from a single-shot interferogram using a physics-driven hybrid feature calibration network.

Applied optics·2026
Same journal

Ultra-high-Q Fano resonance based on coupled topological corner states in Kagome photonic crystals.

Applied optics·2026
See all related articles

This study introduces a novel method using a second LED light source to eliminate ghost steps in white-light interferometry measurements. This technique improves high-accuracy topography measurements of challenging surfaces.

Area of Science:

  • Metrology
  • Optical Engineering
  • Surface Science

Background:

  • White-light interferometry is standard for high-accuracy topography.
  • Large surface tilts and height steps cause systematic errors due to diffraction and dispersion.
  • These effects lead to deviations between envelope and phase-based height measurements, causing ghost steps.

Purpose of the Study:

  • To identify and eliminate ghost steps in white-light interferometry measurements.
  • To enable high-resolution measurement of curved or structured specular surfaces previously restricted by systematic errors.

Main Methods:

  • Utilized a secondary LED emitting light at a different mean wavelength.
  • Applied this dual-wavelength approach to analyze interference signals.

Related Experiment Videos

Main Results:

  • Successfully identified and eliminated ghost steps caused by diffraction and dispersion.
  • Enabled accurate high-resolution topography measurements on surfaces with large tilts and steps.
  • Extended the capability to measure complex curved and structured specular surfaces.

Conclusions:

  • The dual-wavelength LED method effectively overcomes limitations of standard white-light interferometry.
  • This advancement significantly enhances the reliability and applicability of topography measurements for challenging surfaces.