Ultranarrow plasmon resonances from annealed nanoparticle lattices

Shikai Deng, Ran Li, Jeong Eun Park, Jun Guan, Priscilla Choo, Jingtian Hu, Paul J.M. Smeets, Teri W. Odom

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)23380-23384
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number38
DOIs
Publication statusPublished - Sep 22 2020

Keywords

  • lattice plasmons
  • nanolasing
  • quality factor
  • surface lattice resonances
  • thermal annealing

ASJC Scopus subject areas

  • General

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