Journal
NANO LETTERS
Volume 20, Issue 2, Pages 1468-1474Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05342
Keywords
lattice plasmons; surface lattice resonances; waveguide; band structure engineering; colloidal quantum dots; laser directionality
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Funding
- National Science Foundation (NSF) [DMR-1904385]
- DOD [N00014-17-1-3023]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- Materials Research Science and Engineering Center (MRSEC) [DMR-1720139]
- State of Illinois
- Northwestern University
- SHyNE Resource (NSF) [ECCS-1542205]
- MRSEC program (NSF) at the Materials Research Center [DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois through the TIN
- Quest high performance computing facility at Northwestern University - Office of the Provost
- Quest high performance computing facility at Northwestern University - Office for Research
- Northwestern University Information Technology
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Ontario Research Fund Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
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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 Delta 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 (Gamma 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.
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