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Two-Dimensional Microscopy in Microbiology01:29

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Related Experiment Video

Updated: Feb 4, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Three-dimensional tomographic microscopy technique with multi-frequency combination with partially coherent

Jiaji Li1,2,3, Qian Chen1,2,4, Jiasong Sun1,2,3

  • 1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, No. 200 Xiaolingwei Street, Nanjing, Jiangsu Province 210094, China.

Biomedical Optics Express
|September 28, 2018
PubMed
Summary

We developed a multi-frequency combination optical diffraction tomographic technique for high-resolution 3D imaging of unstained samples. This method enhances phase contrast and resolution, offering versatile applications in biological research.

Keywords:
(100.3010) Image reconstruction techniques(100.5070) Phase retrieval(110.6960) Tomography(170.3880) Medical and biological imaging(170.6900) Three-dimensional microscopy

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Area of Science:

  • Optics
  • Biomedical Imaging
  • Microscopy

Background:

  • Quantitative phase imaging (QPI) is crucial for label-free biological specimen analysis.
  • Traditional optical diffraction tomography (ODT) faces limitations in resolution and phase contrast.
  • Achieving high-resolution 3D imaging without staining remains a significant challenge in microscopy.

Purpose of the Study:

  • To introduce and validate a novel three-dimensional (3D) optical diffraction tomographic technique using multi-frequency combination (MFC-ODT).
  • To enhance the 3D quantitative phase imaging of unlabeled specimens by improving resolution and phase contrast.
  • To explore the imaging performance of annular illumination and its complementary role with circular apertures.

Main Methods:

  • Acquisition of three sets of through-focus intensity images using annular and circular apertures with varying coherence parameters.
  • Combination of 3D phase optical transfer functions (POTFs) from different illumination apertures to create a synthesized frequency response.
  • Derivation and analysis of the 3D POTF for arbitrary illumination pupils, including annular illumination.
  • Implementation of high numerical aperture (NA) illumination and detection for optimal resolution.

Main Results:

  • Achieved high-quality, low-noise 3D reconstructions with imaging resolution up to the incoherent diffraction limit.
  • Demonstrated effective mitigation of phase-contrast washout in high-NA circular apertures by incorporating a complementary annular aperture.
  • Attained a theoretical transverse resolution of 200 nm and an axial resolution of 645 nm.
  • Successfully reconstructed 3D refractive index maps of simulated targets, polystyrene beads, and unstained biological samples.

Conclusions:

  • The multi-frequency combination optical diffraction tomographic (MFC-ODT) technique provides high-resolution 3D quantitative phase imaging for unlabeled specimens.
  • MFC-ODT effectively boosts phase contrast and imaging resolution, overcoming limitations of conventional methods.
  • The technique's compatibility with commercial microscopes suggests broad applicability in biological and biomedical research for label-free imaging.