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This study combines 4Pi microscopy with RESOLFT nanoscopy for sharper, more light-efficient 3D imaging of living cells. The new method overcomes previous limitations, enabling nanoscale imaging in challenging cellular regions.

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Area of Science:

  • Optics and Photonics
  • Biophysics
  • Microscopy

Background:

  • 4Pi microscopy offers high resolution and light efficiency in 3D nanoscopy.
  • Previous 4Pi arrangements were limited by signal discrimination issues.
  • RESOLFT (REversible Saturable Optically Linear Fluorescence) nanoscopy provides high resolution.

Purpose of the Study:

  • To combine 4Pi microscopy with RESOLFT nanoscopy for improved 3D super-resolution imaging.
  • To enable low-light level nanoscale imaging of living cells.
  • To overcome limitations of previous 4Pi arrangements.

Main Methods:

  • Utilized a 4Pi arrangement with opposing objective lenses.
  • Applied two-photon absorption for on-switching fluorescent proteins in RESOLFT nanoscopy.
  • Developed a fluorescence read-out scheme.

Main Results:

  • Achieved significantly reduced signal lobes in the 4Pi-RESOLFT combination.
  • Enabled low-light level, 3D nanoscale imaging of living cells.
  • Demonstrated robust imaging of densely packed, axially extended cellular regions.

Conclusions:

  • The 4Pi-RESOLFT combination overcomes previous limitations for 3D nanoscopy.
  • This method allows for robust, high-resolution imaging of challenging biological samples.
  • The fluorescence read-out scheme enhances signal-to-noise ratio and resolution.