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Spatially Resolved Cross-Linking Characterization by Imaging Low-Coherence Interferometry.

Christopher Taudt1,2,3, Bryan Nelsen4,5, Elisabeth Rossegger6

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This summary is machine-generated.

A new method uses a low-coherence interferometer and imaging spectrometer to analyze polymer cross-linking. This technique accurately measures refractive index differences, crucial for material characterization and quality control.

Keywords:
cross-linking characterizationdispersion-enhanced low-coherence interferometryinterferometryphotoresistsemiconductor manufacturingwhite-light interferometry

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Area of Science:

  • Polymer Science
  • Optical Metrology
  • Materials Characterization

Background:

  • Characterizing cross-linking in polymers like waveguide polymers is essential for material performance.
  • Existing methods may lack the precision or speed required for detailed analysis.

Purpose of the Study:

  • To develop and validate a novel, scan-free method for characterizing cross-linking differences in polymers.
  • To establish a technique for precise refractive index determination based on optical thickness.

Main Methods:

  • Utilized a low-coherence interferometer combined with an imaging spectrometer for scan-free data acquisition.
  • Developed a novel algorithm to interpret spectral-phase data as wavelength-dependent optical thickness.
  • Correlated optical thickness measurements with refractive index and degree of cross-linking.

Main Results:

  • Achieved high accuracy in refractive index measurements, in the range of 10-6.
  • Demonstrated the ability to distinguish optical thickness differences as small as ±1.5 μm.
  • Successfully characterized photo-lithographically produced polymer samples with defined cross-linking variations.

Conclusions:

  • The developed method provides a highly accurate and efficient means to characterize polymer cross-linking.
  • This technique offers significant potential for quality control and material development in polymer optics.
  • The scan-free approach and novel algorithm enhance precision in determining material properties.