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Topological Spaser.

Jhih-Sheng Wu1, Vadym Apalkov1, Mark I Stockman1

  • 1Center for Nano-Optics (CeNO) and Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA.

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|January 25, 2020
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Summary
This summary is machine-generated.

Researchers developed a topological spaser using plasmonic nanoshells. This device exhibits bistability, enabling ultrafast optical memory and chiral sensing applications.

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Area of Science:

  • Plasmonics
  • Topological photonics
  • Condensed matter physics

Background:

  • Spasers (Surface Plasmon Amplification by Stimulated Emission of Radiation) are nanoscale lasers.
  • Topological concepts are increasingly applied to control light propagation.
  • Chiral light-matter interactions are crucial for sensing and information processing.

Purpose of the Study:

  • To theoretically introduce a novel topological spaser.
  • To investigate its light generation properties and potential applications.
  • To explore spontaneous symmetry breaking in plasmonic systems.

Main Methods:

  • Theoretical modeling of a hexagonal array of plasmonic metal nanoshells.
  • Analysis of surface plasmon modes in K and K' valleys.
  • Investigation of mode competition and bistability.

Main Results:

  • Generation of two mutually time-reversed chiral surface plasmon modes with opposite topological charges (±1).
  • Observation of spontaneous symmetry breaking due to mode competition, leading to bistability.
  • Identification of a two-dimensional E' representation of the D3h point symmetry group for the modes.

Conclusions:

  • The proposed topological spaser demonstrates unique chiral light generation.
  • Its bistability offers potential for ultrafast all-optical memory and information processing.
  • The device shows promise for advanced biomedical detection and sensing with chirality resolution.