@article{850dbc830a1945cda9438f8e6d36c47d,
title = "Engineering Directionality in Quantum Dot Shell Lasing Using Plasmonic Lattices",
abstract = "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 ({\^I}{"} 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.",
keywords = "band structure engineering, colloidal quantum dots, laser directionality, lattice plasmons, surface lattice resonances, waveguide",
author = "Jun Guan and Sagar, {Laxmi Kishore} and Ran Li and Danqing Wang and Golam Bappi and Watkins, {Nicolas E.} and Bourgeois, {Marc R.} and Larissa Levina and Fengjia Fan and Sjoerd Hoogland and Oleksandr Voznyy and {Martins De Pina}, Joao and Schaller, {Richard D.} and Schatz, {George C.} and Sargent, {Edward H.} and Odom, {Teri W.}",
note = "Funding Information: This work was supported by the National Science Foundation (NSF) under DMR-1904385 and the Vannevar Bush Faculty Fellowship from DOD under N00014-17-1-3023. This work used the Northwestern University Micro/Nano Fabrication Facility (NUFAB), which is partially supported by Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205), the Materials Research Science and Engineering Center (MRSEC) (DMR-1720139), the State of Illinois, and Northwestern University. This work made use of the EPIC, SPID, and Keck-II facilities of Northwestern University{\textquoteright}s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-1542205), the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the International Institute for Nanotechnology (IIN), the Keck Foundation, and the State of Illinois through the IIN. This research was supported in part by the Quest high performance computing facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This research was supported by the Ontario Research Fund – Research Excellence Program and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = feb,
day = "12",
doi = "10.1021/acs.nanolett.9b05342",
language = "English (US)",
volume = "20",
pages = "1468--1474",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "2",
}