Bound state in the continuum in slab waveguide enables low-threshold quantum-dot lasing

Abstract

Colloidal quantum dots (CQDs) are a promising gain material for solution-processed, wavelength-tunable lasers, with potential application in displays, communications, and biomedical devices. In this work, we combine a CQD film with an array of titanium dioxide (TiO2) nanoantennas to achieve lasing via bound states in the continuum (BICs), which are symmetry-protected cavity modes with giant quality factors. Here, the BICs arise from slab waveguide modes in the planar film, coupled to the periodic nanoantenna array. We engineer the thickness of the CQD film and size of the nanoantennas to achieve a BIC with good spatial and spectral overlap with the CQDs, based on a 2nd-order TE-polarized waveguide mode. We obtain room-temperature lasing with a low threshold of approximately 11 kW/cm2 (peak intensity) under 5 ns-pulsed optical excitation. This work sheds light on the optical modes in solution-processed, distributed-feedback lasers, and highlights BICs as effective, versatile, surface-emitting lasing modes.

arXiv comment30 pages, 7 figures

References in corpus (11)

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• Topological nature of bound states in the radiation continuum
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• Generating optical vortex beams by momentum-space polarization vortices centered at bound states in the continuum
• Nonradiating Photonics with Resonant Dielectric Nanostructures
• Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems
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• Low Threshold Bound State in the Continuum Lasers in Hybrid Lattice Resonance Metasurfaces
• Lasing action in single subwavelength particles supporting supercavity modes
• Phase-change perovskite tunable microlaser

Cited by in corpus (7)

• Ultra-low threshold continuous-wave quantum dot mini-BIC lasers
• Room Temperature Exciton-Polariton Condensation in Silicon Metasurfaces Emerging from Bound States in the Continuum
• High topological charge lasing in quasicrystals
• Polariton lasing in Mie-resonant perovskite nanocavity
• Topological invariants and topological charges in photonic systems
• Dynamically Switchable Polarization Lasing between q-BIC and Bragg Resonance Modes
• Long-range quantum emitter interactions mediated by a non-local metasurface: Application to qubit-qubit entanglement