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Super-Resolution Optical Lithography with DNA.

Shi Ho Kim1, Yu Liu1, Conner Hoelzel1

  • 1Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States.

Nano Letters
|August 20, 2019
PubMed
Summary

We developed a new super-resolution microscopy technique using DNA to build nanoparticle assemblies with nanoscale precision. This method allows for the creation of complex structures below the optical diffraction limit for advanced research and device development.

Keywords:
DNA-directed assemblynanoparticle assemblyoptical lithographysingle-molecule FRETsmFRETsuper-resolution microscopy

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Microscopy

Background:

  • Super-resolution microscopy enables measurements beyond the optical diffraction limit.
  • Existing optical techniques lack the precision to construct nanoparticle assemblies with designed shapes and internal structures at the nanoscale.

Purpose of the Study:

  • To develop an efficient, versatile, and accessible super-resolution microscopy method for constructing nanoparticle assemblies.
  • To achieve spatial resolution below the optical diffraction limit for precise nanoscale construction.

Main Methods:

  • Utilized DNA hairpins and a photoactivated DNA cross-linker.
  • Employed single-molecule fluorescence resonance energy transfer (smFRET) microscopy.
  • Leveraged stochastic fluorescence blinking from DNA hairpin dynamics for precise localization and solidification within target areas.

Main Results:

  • Demonstrated construction of nanoparticle assemblies with nanoscale precision.
  • Achieved spatial resolution below the optical diffraction limit.
  • Successfully solidified DNA hairpins within predesigned target areas smaller than the diffraction limit.

Conclusions:

  • The developed method enables the creation of nanoparticle assemblies with designed shapes and internal structures at optical super-resolution.
  • This technique provides a new tool for investigating photophysical and optoelectronic properties of nanoscale assemblies.
  • Opens opportunities for developing novel nanoscale devices.