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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Multiphoton Upconversion Enhanced by Deep Subwavelength Near-Field Confinement.

Jiahui Xu1, Zhaogang Dong2, Mohamed Asbahi2

  • 1Department of Chemistry and The N.1 Institute for Health, National University of Singapore, Singapore 117543, Singapore.

Nano Letters
|March 9, 2021
PubMed
Summary

Researchers enhanced anti-Stokes emission using lanthanide-activated nanocrystals in gold nanotrenches. This boosts upconversion efficiency by 100,000-fold, enabling miniaturized photonic devices.

Keywords:
Upconversiondeep subwavelengthnonlinear optical enhancementplasmonic nanostructuresself-assembly

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Area of Science:

  • Photonics and Nanotechnology
  • Materials Science

Background:

  • Efficient anti-Stokes emission is crucial for miniaturized photonic devices.
  • Current methods using subwavelength crystals and plasmonic nanostructures suffer from low upconversion efficiency due to low absorption coefficients.

Purpose of the Study:

  • To demonstrate on-chip, site-specific integration of lanthanide-activated nanocrystals within gold nanotrenches.
  • To enhance anti-Stokes luminescence and upconversion efficiency through plasmonic coupling.

Main Methods:

  • Bottom-up self-assembly of lanthanide-activated nanocrystals within gold nanotrenches with sub-25 nm gaps.
  • Coupling of upconversion nanoparticles to subwavelength gap-plasmon modes.
  • Numerical investigations of photonic hotspot confinement and field intensity.

Main Results:

  • Achieved a 3.7-fold boost in spontaneous emission rates.
  • Enhanced upconversion efficiency by a factor of 100,000.
  • Demonstrated confinement of excitation radiation into nanometric photonic hotspots with high field intensity.

Conclusions:

  • Coupling lanthanide-activated nanocrystals to subwavelength gap-plasmon modes significantly enhances upconversion processes.
  • This approach enables the development of ultracompact photonic devices.
  • Potential applications include on-chip, background-free molecular sensors and low-threshold upconversion lasers.