preprintACS PhotonicsFeb 11, 2026HYBRID OA

Topological Lasing from Thouless Pumping in Bilayer Photonic Crystal

HNH.C. NguyenDXDung Xuan NguyenHCH. Chau NguyenHCH. Chau NguyenTLThibaud Louvet

University of the Basque Country · Brown University · +15 more institutions

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Abstract

Topological lasing leverages concepts from topological physics to achieve single-mode light amplification within topological bandgaps, offering robustness against fabrication imperfections. Recent advances in microelectromechanical systems (MEMSs) and phase-change materials (PCMs) at the subwavelength scale promise new avenues for dynamically reconfigurable topological lasers, enabling robust and tunable nanoscale light sources. Here, we numerically demonstrate a dynamically reconfigurable lasing action at telecom wavelengths in a bilayer photonic crystal through the mechanisms of Thouless pumping. By designing two competing periodic potentialsone slowly translating photonic grating atop another stationary…

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Topics & keywords

Topics
Keywords
  • Position and momentum space
  • Topology (electrical circuits)
  • Physics
  • Momentum (technical analysis)
  • Geometric phase
  • Photonic crystal
  • Photonics
  • Quantum mechanics
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