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Improving Upconversion Efficiency Based on Cross-Patterned Upconversion Material Slot Waveguides on a Silicon Layer.

Youngsoo Kim1, Kihwan Moon2, Young Jin Lee3

  • 1Department of Physics, Chung-Ang University, Seoul 06974, Korea. youngsoo.kim94@gmail.com.

Nanomaterials (Basel, Switzerland)
|April 17, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel slot waveguide design that significantly enhances upconversion (UC) material efficiency. The new structure boosts near-infrared light absorption and visible light emission, paving the way for practical optical devices.

Keywords:
Purcell effectenergy harvestingslot modeupconversionwavelength conversion

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Photonics

Background:

  • Upconversion (UC) materials convert near-infrared (NIR) light to visible light, enhancing optical device performance.
  • Current UC material efficiency is limited, hindering practical applications like solar cells.

Purpose of the Study:

  • To improve the efficiency of upconversion materials for practical optical devices.
  • To investigate the effect of a cross-patterned slot waveguide structure on UC performance.

Main Methods:

  • Fabrication of a cross-patterned slot waveguide with UC material embedded in a high-index semiconductor.
  • Analysis of NIR absorption and spontaneous emission enhancement rates within the UC slot waveguide.

Main Results:

  • NIR absorption increased 25-fold compared to film structures due to slot waveguide mode confinement.
  • Spontaneous emission enhancement rate at 660 nm increased 9.6-fold (Purcell effect).
  • Overall UC efficiency improved 240-fold due to combined absorption and emission enhancements.

Conclusions:

  • The proposed UC slot array structure offers a significant improvement in upconversion efficiency.
  • This double resonance enhancement is promising for practical optical device applications.