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Mapping local retardance in birefringent samples using polarization sensitive optical coherence tomography.

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Area of Science:

  • Biomedical Optics
  • Optical Coherence Tomography
  • Materials Science

Background:

  • Polarization-sensitive optical coherence tomography (PSOCT) is widely used for characterizing birefringent samples.
  • Conventional PSOCT measures cumulative retardance, which is inaccurate when the sample's optical axis varies with depth.
  • Accurate depth-resolved retardance is crucial for understanding birefringent material properties and biological tissues.

Purpose of the Study:

  • To propose and validate a novel method for extracting depth-resolved local retardance from standard PSOCT data.
  • To address the limitations of cumulative retardance measurements in samples with spatially varying optical axes.
  • To enable more precise characterization of birefringent properties in heterogeneous samples.

Main Methods:

  • A Jones calculus-based algorithm was developed to process conventional PSOCT data.
  • The method utilizes circularly polarized incident light in a standard PSOCT setup.
  • The algorithm reconstructs local retardance from cumulative retardance measurements.

Main Results:

  • The proposed method successfully extracts depth-resolved local retardance.
  • Validation was performed on samples with both homogeneous and depth-dependent optical axes.
  • The algorithm accurately determines local retardance, even in complex birefringent structures.

Conclusions:

  • The developed Jones calculus algorithm provides accurate depth-resolved local retardance from conventional PSOCT.
  • This method enhances the capability of PSOCT for detailed analysis of birefringent materials and tissues.
  • It offers a significant improvement for applications requiring precise characterization of optical axis variations.