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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

505
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
505

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Related Experiment Video

Updated: Aug 15, 2025

A Protocol for Real-time 3D Single Particle Tracking
10:16

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Three-dimensional tracking using a single-spot rotating point spread function created by a multiring spiral phase

Keith Bonin1,2, Sudhakar Prasad3, Will Caulkins1

  • 1Wake Forest University, Department of Physics, Winston-Salem, North Carolina, United States.

Journal of Biomedical Optics
|January 2, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a simple, low-cost diffractive optical element (DOE) system for precise 3D tracking of microscopic fluorescent objects. The novel single-spot rotating point spread function (SS-RPSF) achieved high localization precision in biological samples.

Keywords:
diffractive optical elementsfluorescenceimagingmicroscopythree dimensionstracking

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Area of Science:

  • Biophysics
  • Optical microscopy
  • Nanotechnology

Background:

  • Three-dimensional (3D) imaging and object tracking are crucial for advancing medical and biological research.
  • Diffractive optical elements (DOEs) enable depth information conversion into 2D image modifications for multifocal imaging.
  • Further insights into DOE designs are needed to drive progress in this field.

Purpose of the Study:

  • To develop a simple, low-cost diffractive optical element (DOE) system for precise 3D tracking of microscopic fluorescent objects in biological systems.
  • To achieve high axial and transverse localization precision for microscopic objects.
  • To validate the system's performance in live biological samples.

Main Methods:

  • Designed a multiring spiral phase plate (SPP) to generate a single-spot rotating point spread function (SS-RPSF).
  • Employed Bessel beams in the design process to prevent rotational ambiguities and ensure a broad depth range.
  • Integrated the SPP into a standard microscope's Nomarski prism slider for performance evaluation.

Main Results:

  • Achieved bead localization precision of 15 nm in transverse dimensions and 30 nm axially over a 5 µm range.
  • Demonstrated higher axial precision (10 nm) within a shallower focal depth of 2 µm.
  • Validated 3D diffusion constants of chromatin in live cells, matching expected values.

Conclusions:

  • Precise 3D localization and tracking of microscopic objects are feasible using a SS-RPSF SPP.
  • The proposed method requires only minor modifications to standard microscope systems.
  • This approach offers a cost-effective solution for advanced 3D imaging in biological research.