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Area of Science:

  • * Condensed matter physics
  • * Nanophotonics
  • * Plasmonics

Background:

  • * Plasmonic lattices offer unique optical properties.
  • * Understanding lasing modes in such structures is crucial for device applications.

Purpose of the Study:

  • * To experimentally investigate lasing in hexamer plasmonic lattices.
  • * To theoretically analyze the lasing modes and their topological properties.
  • * To explore the relationship between unit cell scale, mode quality, and lasing behavior.

Main Methods:

  • * Experimental observation of lasing in a hexamer plasmonic lattice.
  • * Theoretical analysis to identify lasing modes as quasi-bound-states in continuum.
  • * T-matrix simulations to calculate mode quality (Q) factors.

Main Results:

  • * Tuning the unit cell scale modifies the polarization properties of the emitted light.
  • * Lasing modes were identified with topological charges of zero, one, or two.
  • * Mode Q factors are dependent on the unit cell scale, with highest-Q modes being lasing modes.

Conclusions:

  • * The system exhibits a loss-driven transition between lasing in trivial and high-order topological charge modes.
  • * Plasmonic lattice geometry can control topological properties of lasing modes.