Engineering Directionality in Quantum Dot Shell Lasing Using Plasmonic Lattices

Jun Guan, Laxmi Kishore Sagar, Ran Li, Danqing Wang, Golam Bappi, Nicolas E. Watkins, Marc R. Bourgeois, Larissa Levina, Fengjia Fan, Sjoerd Hoogland, Oleksandr Voznyy, Joao Martins De Pina, Richard D. Schaller, George C. Schatz, Edward H. Sargent, Teri W. Odom*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We report how the direction of quantum dot (QD) lasing can be engineered by exploiting high-symmetry points in plasmonic nanoparticle (NP) lattices. The nanolaser architecture consists of CdSe-CdS core-shell QD layers conformally coated on two-dimensional square arrays of Ag NPs. Using waveguide-surface lattice resonances (W-SLRs) near the Δpoint in the Brillouin zone as optical feedback, we achieved lasing from the gain in CdS shells at off-normal emission angles. Changing the periodicity of the plasmonic lattices enables other high-symmetry points (Î" or M) of the lattice to overlap with the QD shell emission, which facilitates tuning of the lasing direction. We also increased the thickness of the QD layer to introduce higher-order W-SLR modes with additional avoided crossings in the band structure, which expands the selection of cavity modes for any desired lasing emission angle.

Original languageEnglish (US)
Pages (from-to)1468-1474
Number of pages7
JournalNano letters
Issue number2
StatePublished - Feb 12 2020


  • band structure engineering
  • colloidal quantum dots
  • laser directionality
  • lattice plasmons
  • surface lattice resonances
  • waveguide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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