Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 38, Pages 23380-23384Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2008818117
Keywords
lattice plasmons; thermal annealing; quality factor; surface lattice resonances; nanolasing
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Funding
- Vannevar Bush Faculty Fellowship from the US Department of Defense [N00014-17-13023]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- Materials Research Science and Engineering Center [DMR-1720139]
- State of Illinois
- Northwestern University
- SHyNE Resource
- Materials Research Science and Engineering Center program (Grant NSF) at the Materials Research Center [DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
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This paper reports how the spectral linewidths of plasmon resonances can be narrowed down to a few nanometers by optimizing the morphology, surface roughness, and crystallinity of metal nanoparticles (NPs) in two-dimensional (2D) lattices. We developed thermal annealing procedures to achieve ultranarrow surface lattice resonances (SLRs) with full-width at half-maxima linewidths as narrow as 4 nm from arrays of Au, Ag, Al, and Cu NPs. Besides annealing, we developed a chemical vapor deposition process to use Cu NPs as catalytic substrates for graphene growth. Graphene-encapsulated Cu NPs showed the narrowest SLR linewidths (2 nm) and were stable for months. These ultranarrow SLR nanocavity modes supported even narrower lasing emission spectra and high nonlinearity in the input-output light-light curves.
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