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Higher-Order Nonsaturated Hyperlinear Upconversion Image Scanning Microscopy for Super-Resolution Imaging.

Hongmei Peng1, Weilong Kong1, Zitong Zhang2

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This study introduces nonsaturated hyperlinear upconversion image scanning microscopy (UISM), a novel super-resolution technique. UISM utilizes lanthanide-doped upconversion nanoparticles (UCNPs) to achieve significantly enhanced image resolution beyond conventional methods.

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Area of Science:

  • Microscopy
  • Nanotechnology
  • Biophysics

Background:

  • Confocal laser scanning microscopy (CLSM) faces resolution-quality trade-offs.
  • Image scanning microscopy (ISM) offers improvements but has limited resolution gains.
  • Existing super-resolution methods often involve complex procedures or photobleaching.

Purpose of the Study:

  • To develop a novel super-resolution microscopy technique using upconversion nanoparticles.
  • To overcome the resolution limitations of conventional and ISM techniques.
  • To achieve enhanced spatial resolution beyond the diffraction limit.

Main Methods:

  • Developed nonsaturated hyperlinear upconversion image scanning microscopy (UISM).
  • Employed lanthanide-doped upconversion nanoparticles (UCNPs) with tunable excitation power.
  • Utilized near-infrared excitation at 980 nm for image acquisition.

Main Results:

  • Achieved spatial resolutions of 133 nm (455 nm emission) and 196 nm (800 nm emission).
  • Demonstrated resolution enhancement significantly beyond twice that of CLSM.
  • Obtained a shrunken point spread function by tuning UCNP response at the nonsaturated excitation threshold.

Conclusions:

  • Nonsaturated hyperlinear UISM offers a novel strategy for super-resolution imaging.
  • This technique enables resolution far beyond conventional laser scanning microscopy.
  • The approach provides a new pathway for advanced microscopy with enhanced spatial resolution.