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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Quantitative reflection phase mesoscopy by remote coherence tuning of phase-shift interference patterns.

Elad Arbel1, Alberto Bilenca2

  • 1Biomedical Engineering Department, Ben-Gurion University of the Negev, 1 Ben Gurion Blvd, Be'er-Sheva 8410501, Israel.

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|July 29, 2015
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Summary
This summary is machine-generated.

We developed a phase mesoscope by integrating a Michelson interferometer with a brightfield microscope. This system quantitatively measures phase distribution in transparent samples with high sensitivity and resolution.

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Area of Science:

  • Optical microscopy
  • Phase contrast imaging
  • Metrology

Background:

  • Conventional phase-contrast microscopy offers qualitative imaging of transparent samples at the mesoscopic scale.
  • Quantitative phase measurements are crucial for detailed analysis in various scientific fields.

Purpose of the Study:

  • To develop a quantitative phase imaging system for mesoscopic fields-of-view.
  • To enhance the capabilities of standard brightfield microscopes for transparent sample analysis.

Main Methods:

  • Integration of a compact, unbalanced phase-shifting Michelson interferometer into a reflected brightfield microscope.
  • Utilizing white light illumination and low-power infinity-corrected objectives.
  • Development of a phase mesoscope for quantitative reflection phase distribution retrieval.

Main Results:

  • Achieved high temporal (1.38 nm) and spatial (0.87 nm) axial-displacement sensitivity.
  • Obtained micrometer lateral resolution (2.3 μm) across a mesoscopic field-of-view (2.25 × 1.19 mm²).
  • Demonstrated quantitative evaluation of nanometer-thick glass gratings and optical thickness mapping of human cancer cells without area scanning.

Conclusions:

  • The phase mesoscope provides quantitative, high-sensitivity phase measurements of transparent samples.
  • The system is applicable to diverse fields including materials science, cell biology, and fluid dynamics.
  • Offers a powerful tool for mesoscopic quantitative phase imaging beyond qualitative microscopy.