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Ultra-high-Q resonances in plasmonic metasurfaces.

M Saad Bin-Alam1, Orad Reshef2, Yaryna Mamchur1,3

  • 1School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, Canada.

Nature Communications
|February 13, 2021
PubMed
Summary

Researchers developed a plasmonic metasurface using surface lattice resonances (SLRs) to overcome resistive losses. This breakthrough achieves a record high quality-factor (Q-factor), enabling efficient light manipulation for advanced optical devices.

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Area of Science:

  • Photonics and Nanotechnology
  • Metasurface Optics

Background:

  • Plasmonic nanostructures offer potential for ultra-thin, sub-wavelength optical devices with low operating thresholds and nonlinear optical properties.
  • Significant resistive losses in plasmonic metasurfaces have limited their practical application, driving research towards alternative dielectric platforms.
  • Existing plasmonic approaches often struggle with balancing field enhancement and energy loss.

Purpose of the Study:

  • To investigate the potential of surface lattice resonances (SLRs) in plasmonic metasurfaces to overcome inherent loss limitations.
  • To achieve a high quality-factor (Q-factor) plasmonic metasurface for enhanced optical performance.
  • To explore the feasibility of SLRs for light field tailoring and the development of wavelength-scale optical devices.

Main Methods:

  • Fabrication of a plasmonic metasurface designed to support surface lattice resonances (SLRs).
  • Characterization of the metasurface's optical properties, focusing on resonance phenomena and quality-factor (Q-factor) measurements.
  • Analysis of light-matter interactions, including field enhancement and confinement, within the SLR regime.

Main Results:

  • Demonstrated a plasmonic metasurface exhibiting a record-breaking quality-factor (Q-factor) of 2340 in the telecommunication C band.
  • Confirmed that SLRs provide significant field enhancement and strong light confinement, similar to localized plasmonic resonances.
  • Showcased the effectiveness of SLRs in mitigating the detrimental effects of resistive losses.

Conclusions:

  • Surface lattice resonances (SLRs) offer a viable pathway to high-performance plasmonic metasurfaces with significantly reduced losses.
  • SLRs present a novel and underexplored approach for precise control over incident light fields.
  • This work opens possibilities for flexible, wavelength-scale optical devices applicable to diverse resonant optical applications.