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Plasmonic gap-mode nanocavities with metallic mirrors in high-index cladding.

Pi-Ju Cheng1, Chen-Ya Weng, Shu-Wei Chang

  • 1Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan.

Optics Express
|June 6, 2013
PubMed
Summary

We analyzed plasmonic gap-mode nanocavities for lasing, finding that silver coatings significantly enhance reflectivity. This overcomes mirror loss challenges, achieving a high quality factor and low threshold gain for telecommunication applications.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Plasmonic gap-mode nanocavities are crucial for advanced optical devices.
  • High-index cladding materials enhance mode properties for lasing.
  • Mirror loss is a significant limitation for achieving lasing in such cavities.

Purpose of the Study:

  • To theoretically analyze plasmonic gap-mode nanocavities with thick cladding layers.
  • To investigate the potential of the first-order hybrid gap mode for lasing.
  • To mitigate mirror loss challenges using silver coatings.

Main Methods:

  • Theoretical analysis of nanocavity structures.
  • Simulation of optical properties with varying silver coating thicknesses.
  • Calculation of quality factor and threshold gain.

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Main Results:

  • The first-order hybrid gap mode shows promise for lasing with high-index cladding.
  • Silver coatings substantially enhance reflectivity (>95%) at end facets.
  • A quality factor of ~150 and threshold gain <1500 cm⁻¹ were achieved with 50 nm coating and 1.51 μm cavity length.

Conclusions:

  • Silver coatings effectively reduce mirror loss in plasmonic gap-mode nanocavities.
  • Optimized nanocavities with silver coatings are viable for low-threshold lasing at telecommunication wavelengths.
  • This research contributes to the development of efficient plasmonic lasers.