Details

Autor(en) / Beteiligte

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

Titel

Engineering Directionality in Quantum Dot Shell Lasing Using Plasmonic Lattices

Ist Teil von

• Nano letters, 2020-02, Vol.20 (2), p.1468-1474

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Δ point 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 (Γ 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.