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Comparison of Different Polarization Sensitive Second Harmonic Generation Imaging Techniques.

Mehdi Alizadeh1, Masood Ghotbi2, Pablo Loza-Alvarez3

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Polarization sensitive second harmonic generation (pSHG) microscopy images molecular structures in biological tissues. Single scan pSHG (SS-pSHG) offers faster imaging of starch granule orientation compared to traditional pSHG.

Keywords:
Medical and biological imagingNonlinear MicroscopyPolarizationSecond harmonic generation

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Area of Science:

  • Biophysics
  • Microscopy Techniques
  • Materials Science

Background:

  • Polarization sensitive second harmonic generation (pSHG) microscopy non-invasively reveals molecular structure in biological tissues.
  • Acquiring pSHG data requires sample scanning with varied excitation beam polarizations, which can be time-consuming for dynamic in vivo processes.

Purpose of the Study:

  • To determine the orientation of supramolecular assemblies in starch granules using pSHG and single scan pSHG (SS-pSHG) microscopy.
  • To compare the results obtained from both pSHG and SS-pSHG techniques in forward and backward imaging directions.
  • To present the first pixel-to-pixel comparison of data acquired from the exact same sample area using both pSHG and SS-pSHG.

Main Methods:

  • Utilized polarization sensitive second harmonic generation (pSHG) microscopy.
  • Employed single scan polarization sensitive second harmonic generation (SS-pSHG) microscopy for accelerated data acquisition.
  • Acquired and compared imaging data in both forward and backward directions.

Main Results:

  • Obtained the orientation of second harmonic active supramolecular assemblies in starch granules.
  • Demonstrated good agreement between pSHG and SS-pSHG results in both forward and backward imaging.
  • Provided the first pixel-to-pixel comparison of pSHG and SS-pSHG data from identical sample regions.

Conclusions:

  • SS-pSHG microscopy provides comparable results to traditional pSHG microscopy for analyzing molecular orientation in starch granules.
  • The SS-pSHG technique offers a faster alternative for imaging SHG-active structures without compromising data quality.
  • This study validates SS-pSHG as a viable and efficient method for structural analysis in biological samples.