Quantum Dot-Plasmon Lasing with Controlled Polarization Patterns

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Abstract
The tailored spatial polarization of coherent light beams is important for applications ranging from microscopy to biophysics to quantum optics. Miniaturized light sources are needed for integrated, on-chip photonic devices with desired vector beams; however, this issue is unresolved because most lasers rely on bulky optical elements to achieve such polarization control. Here, we report on quantum dot-plasmon lasers with engineered polarization patterns controllable by near-field coupling of colloidal quantum dots to metal nanoparticles. Conformal coating of CdSe–CdS core–shell quantum dot films on Ag nanoparticle lattices enables the formation of hybrid waveguide-surface lattice resonance (W-SLR) modes. The sidebands of these hybrid modes at nonzero wavevectors facilitate directional lasing emission with either radial or azimuthal polarization depending on the thickness of the quantum dot film.
Funding Information
  • U.S. Department of War (N00014-17-1-3023)
  • Natural Sciences and Engineering Research Council of Canada
  • Division of Materials Research (DMR-1608258, DMR-1904385)
  • Ontario Research Fund

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