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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Published on: January 28, 2019

Toroidal lasing spaser.

Yao-Wei Huang1, Wei Ting Chen, Pin Chieh Wu

  • 1Graduate Institute of Applied Physics, National Taiwan University, Taipei, Taiwan.

Scientific Reports
|February 9, 2013
PubMed
Summary

Toroidal metamaterials support unique electromagnetic excitations called toroidal moments. Coupling these with gain media can lead to powerful toroidal lasing spasers for enhanced energy transfer.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Toroidal shapes are prevalent in biological systems and exhibit unique electromagnetic properties.
  • Toroidal moments, distinct from electric or magnetic multipoles, were recently experimentally verified.
  • These moments offer potential for enhanced energy confinement and inter-molecular interactions.

Purpose of the Study:

  • To investigate the potential of toroidal metamaterials for advanced optical applications.
  • To demonstrate enhanced amplification using toroidal resonance modes coupled with gain media.
  • To explore the feasibility of creating toroidal lasing spasers.

Main Methods:

  • Utilized a model toroidal metamaterial system.
  • Coupled an optical gain medium with a high Q-factor toroidal resonance mode.
  • Measured single-pass amplification characteristics.

Main Results:

  • Achieved a single-pass amplification of up to 65 dB.
  • Demonstrated the enhancement of amplification by coupling gain media to toroidal resonance.
  • Showcased the potential for coherent optical radiation generation.

Conclusions:

  • Toroidal metamaterials can significantly enhance optical amplification.
  • The coupling of gain media to toroidal resonance modes is a promising approach for novel light sources.
  • This research paves the way for developing toroidal lasing spasers fueled by plasmonic oscillations.