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Related Experiment Video

Updated: Jun 4, 2026

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy (iPALM)
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Confocal simultaneous phase-shifting interferometry.

Chenguang Zhao1, Jiubin Tan, Jianbo Tang

  • 1Center of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, China.

Applied Optics
|February 24, 2011
PubMed
Summary
This summary is machine-generated.

Confocal simultaneous phase-shifting interferometry (C-SPSI) achieves 1 nm axial depth resolution for ultraprecise measurements. This novel technique enhances confocal microscopy

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Area of Science:

  • Optical Metrology
  • Confocal Microscopy
  • Interferometry

Background:

  • Confocal microscopy traditionally faces limitations in achieving high axial depth resolution, especially with low numerical aperture (NA) objectives.
  • Existing methods struggle to balance large measurement range and long working distances with ultraprecise surface height determination.

Purpose of the Study:

  • To introduce and validate a novel technique, confocal simultaneous phase-shifting interferometry (C-SPSI), for ultraprecise measurements.
  • To overcome the resolution restrictions imposed by low NA objectives in confocal microscopy.

Main Methods:

  • Simultaneous detection of four-channel interference signals with π/2 phase shifts.
  • Integration of optical sectioning with phase unwrapping, utilizing the bipolar property of differential confocal microscopy for main cycle determination.
  • Implementation of C-SPSI for surface height calculation.

Main Results:

  • Achieved an axial depth resolution of 1 nm, irrespective of objective lens NA (low or high).
  • Demonstrated robustness against reflectivity disturbances, validated by imaging microcircuit specimens.
  • Effectively bypassed the limitations of low NA on axial depth resolution in confocal microscopy.

Conclusions:

  • C-SPSI offers a significant advancement in high-resolution 3D surface profiling using confocal microscopy.
  • The method provides a practical solution for ultraprecise measurements requiring large ranges and long working distances.
  • C-SPSI enhances the versatility and applicability of confocal microscopy in demanding metrology applications.