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Researchers developed ultralong photonic nanojets (PNJs) using novel microsphere designs to overcome optical diffraction limits in optical resolution photoacoustic microscopy (ORPAM). This advancement enhances resolution for microscale in vivo imaging applications.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Materials Science

Background:

  • Optical resolution photoacoustic microscopy (ORPAM) offers high-resolution imaging but is limited by optical diffraction.
  • Photonic nanojets (PNJs) can overcome diffraction limits, but their short axial length restricts their use to surface imaging.
  • Developing extended PNJs is crucial for broader applications in photoacoustic imaging.

Purpose of the Study:

  • To investigate novel microsphere designs for generating ultralong photonic nanojets (PNJs).
  • To enhance the viability of PNJs for far-field applications like photoacoustic imaging.
  • To optimize PNJ properties such as length, waist size, and working distance.

Main Methods:

  • Simulated performance of various microsphere designs, including truncated multilayer structures.
  • Analyzed PNJ characteristics: effective length, waist size, working distance, and peak intensity.
  • Evaluated the impact of sphere design and refractive index on PNJ generation.

Main Results:

  • A truncated multilayer microsphere design generated an ultraelongated PNJ exceeding ~138 μm (~172λ) with a working distance of ~26 μm (~32λ).
  • PNJ properties were successfully tuned by altering sphere design and refractive index.
  • Simulations showed an ~11-fold enhancement in lateral resolution in a conventional ORPAM setup using a specific sphere design.

Conclusions:

  • Novel microsphere designs can create ultralong PNJs suitable for advanced photoacoustic imaging.
  • The ability to tune PNJ properties offers a pathway to improved resolution in ORPAM.
  • This research significantly advances the potential of PNJ-enhanced ORPAM for microscale in vivo imaging.