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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Spectroscopic diffraction phase microscopy.

Hoa Pham1, Basanta Bhaduri, Huafeng Ding

  • 1Department of Electrical and Computer Engineering, Beckman Institute for Advanced Science & Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Optics Letters
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

Spectroscopic diffraction phase microscopy (sDPM) measures quantitative phase images at multiple wavelengths. This technique separates refractive index and thickness from phase shifts in biological cells.

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Area of Science:

  • Biophotonics and Imaging
  • Optical Microscopy
  • Spectroscopy

Background:

  • Quantitative phase imaging (QPI) provides label-free contrast for biological samples.
  • Measuring wavelength-dependent optical properties (dispersion) is crucial for accurate material characterization.

Purpose of the Study:

  • To introduce spectroscopic diffraction phase microscopy (sDPM) for multi-wavelength quantitative phase measurements.
  • To enable decoupling of refractive index and thickness of biological samples.
  • To demonstrate dispersion measurements of microspheres and red blood cells (RBCs).

Main Methods:

  • Utilizing a spatial light modulator at the Fourier plane to select specific wavelengths from a broadband source.
  • Employing a grating for spectral dispersion.
  • Implementing sDPM to acquire quantitative phase images at multiple wavelengths.

Main Results:

  • Successfully measured quantitative phase images at various wavelengths.
  • Demonstrated the ability to decouple refractive index and thickness.
  • Performed dispersion measurements on microsphere beads and RBCs, validating the technique.

Conclusions:

  • sDPM is a powerful tool for multi-wavelength quantitative phase imaging.
  • The method allows for precise characterization of optical properties, including dispersion.
  • sDPM has potential applications in biological cell analysis and material science.